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The following tables compare general and technical information for a number of notable webmail providers who offer a web interface in English.
The list does not include web hosting providers who may offer email server and/or client software as a part of hosting package, or telecommunication providers (mobile network operators, internet service providers) who may offer mailboxes exclusively to their customers.
General information on webmail providers and products
Product | Released | Cost | Mailbox storage | Attachment limit | Supported languages | Number of Email Addresses (incl. Aliases) | Conversation threading |
---|---|---|---|---|---|---|---|
AOL Mail | 1993 [1] | Free (with ads) | Unlimited. Limited to 1 TB for new accounts. [2] | 25 MB [3] | 54 [4] | 0 [5] | Yes |
Fastmail | 1999 [6] | $30/year to $90/year [7] | 2 GB to 100 GB [7] | 50 MB [8] | 37 [ citation needed ] | 600, plus 15 for every user in the account [9] | Yes [10] |
Gmail | 2004 [11] | Free (with ads); $6/user/month on the user's domain [12] | free tier: 15 GB [13] (can purchase more) | 25 MB [14] (10 GB per file via Google Drive) [15] | 71 [ citation needed ] | 30 [16] | Yes |
GMX Mail | 1997 [17] | Free (with ads) [18] or Paid (€3–5/month) | 65 GB (free for gmx.com), [19] 1.5 GB (for gmx.de/net) | 50 MB (free), [20] 50–100 MB (paid) | German, English, Spanish, French [21] | Free: 2 ProMail: 10 TopMail: 50 | Yes |
HEY | 2020 [22] | Free 14-day trial $99/year [23] | 100 GB [23] | 300 MB [24] | English [ citation needed ] | ? | No [25] |
Hushmail | 1999 [26] | $49.98 year (Premium) [27] | 10 GB (Premium) [ citation needed ] | 20 MB per file, total 50 MB per mail [28] | English [ citation needed ] | ? | Paid |
iCloud [lower-alpha 1] | 2011 [29] | Free (no ads) or $0.99/month, $2.99/month, or $9.99/month [lower-alpha 2] | 5 GB (Free), 50 GB, 200 GB, or 2 TB monthly [lower-alpha 3] [ citation needed ] | 20 MB [ citation needed ] (5GB per message with Mail Drop via iCloud) [32] | 4 [ citation needed ] | Free: 3 [33] Paid: unlimited through " Hide My Email" [34] | Yes [35] |
Kolab Now | 2013 [ citation needed ] | Free 30-day trial From 4.41 CHF/month (individuals), 5.38 CHF/month (groups) [36] | 2 GB, can purchase more [37] | ? | English [ citation needed ] | ? | No |
Lycos | 1997 [ citation needed ] | $4.95 per month $19.95 yearly [38] | 5 GB [ citation needed ] | 35 MB [ citation needed ] | English [ citation needed ] | ? | Paid |
Mail.com | 1995 [39] | Free (with ads) or $3.95/month or $19.95/year | 65 GB [40] | 30 MB [41] | English, Spanish, French [42] | ? | Paid |
Mail.ru | 1998 [43] | Free (with ads) or paid options | Unlimited [ citation needed ] | 2 GB [44] | 11 [ citation needed ] | ? | Yes |
Mailbox.org | 2014 | 30 day free trial, €1/month, €3/month, €9/month | Light - 2GB Standard - 10GB Premium - 25GB | Light - no storage Standard - 5GB Premium - 50GB | English & German | light - 3 Standard - 25 Premium - 25 | yes |
Mailfence | 2013 [45] [46] | Free (no ads) €2.5/month (Entry) €7.5/month (Pro) €25/month (Ultra) [47] [48] | 500 MB (free) 5 GB (Entry) or 20 GB (Pro) or 50 GB (Ultra) [47] | 10 MB (Free) 50 (Entry/Pro/Ultra) [49] | 11 [50] | ? | Paid [51] |
Outlook.com (Live Mail, Hotmail) | 1996 (Hotmail) [52] 2012 (Outlook) [53] | Free (with ads); Paid option | 15 GB [54] | 32 MB (Unlimited via OneDrive) [ citation needed ] | 106 [ citation needed ] | ? | Yes [55] |
Posteo | 2009 [56] [57] | €1/month to €1,45/month [58] | 2 GB storage (can be increased) | 50 MB | 3 | 2 included up to 20 for an additional charge of 0.10 EUR per alias per month [59] | Yes |
Proton Mail | 2014 [60] | Free (no ads); Multi-tiered pricing | 500 MB (free) | 25 MB [63] | 10 [64] | Free: 1 Plus: 10 Ultimate: 15 [65] | Yes |
Rediffmail | 1997 [ citation needed ] | Free (with ads) and paid: ₹399 (US$4.80)/year for POP3; ₹50 (60¢ US)/month for mobile | Unlimited [ citation needed ] | 25 MB [ citation needed ] | 11 [ citation needed ] | ? | ₹399 (US$4.80) |
Skiff | 2022 | No new accounts accepted since 9 February 2024. Users will have six months to migrate their data before the closure of their services. | "Standard" 10 GB, 15 Gb, 100 GB & 1 TB [66] | 25 MB [67] | 1 [68] | ? | No |
Tuta | 2011 [69] | Free (no ads) [70] €36 year (Personal) [71] | 1 GB Free and Premium, 10GB Teams. Can be upgraded to 10GB, 100GB, or 1TB. [72] | 25 MB [73] | 30 [ citation needed ] | Free: 1 Revolutionary: 15 Legend: 30 [74] | No [75] |
Yahoo! Mail | 1997 [76] | Free (with ads) Yahoo! Mail Plus $49.99 | 1 TB [lower-alpha 4] | 25 MB (150 MB per file via Dropbox) [78] | 27 [ citation needed ] | Free: 3 Plus: 500 [79] | Yes [80] |
Yandex Mail | 2000 [81] | Paid (US$2.42) /month | Unlimited [82] | 22 MB per file, total 30 MB per mail (2 GB per file via Yandex Disk) [83] | 10 [ citation needed ] | ? | Yes [lower-alpha 5] |
Zoho Mail | 2008 [ citation needed ] | Personal Free (no ads); Premium options $24 to $99/user yearly | 5 GB "Lite". "Standard": 10 & 15 GB [84] | 20 MB free, 30 or 50 MB paid [ citation needed ] | 16 [ citation needed ] | ? | Paid [85] |
Product | POP3 support | IMAP support | SMTP support | JMAP support | Cryptographic protocol support | IPv6 support | EAS support |
---|---|---|---|---|---|---|---|
AOL Mail | Yes | Yes | Yes [86] | No | SSL | ? | ? |
Fastmail | Yes | Yes | Yes | Yes | SSL, TLS [87] | No | No |
Gmail | Yes | Yes [lower-alpha 1] | Yes | No | SSL, TLS | Yes | ? |
GMX Mail | Yes | Yes | Yes | No | SSL, TLS | No | ? |
HEY | No [25] | No | No | No | TLS [89] | No | No |
Hushmail | Paid | Paid | Paid | No | SSL, TLS, OpenPGP | ? | ? |
iCloud [lower-alpha 2] | No [90] | Yes | Yes | No | SSL, TLS [90] | No | ? |
Kolab Now | Yes [91] | Yes [91] | Yes | No | SSL/TLS [91] | No | ? |
Lycos | Yes | Yes | Yes | No | SSL/TLS | ? | ? |
Mail.com | Paid | Paid | ? | No | SSL | No | ? |
Mail.ru | Yes | Yes | ? | No | SSL, TLS | ? | ? |
Mailbox.org | Yes | Yes | Yes | No | ? | ? | ? |
Mailfence | Paid [51] | Paid [51] | Yes | No | SSL/TLS, OpenPGP [92] | No | ? |
Outlook.com (Live Mail, Hotmail) | Yes [55] | Yes [55] | ? | No | SSL, [55] Exchange ActiveSync [55] | Yes | ? |
Posteo | Yes | Yes | ? | No | SSL, TLS | No | ? |
Proton Mail | Paid [93] | Paid [93] | No | No | SSL, TLS, Tor, OpenPGP | No | ? |
Rediffmail | Paid [94] | Paid [94] | ? | No | SSL, TLS | ? | ? |
Skiff | No | No | No | No | SSL, TLS, DANE | No | ? |
Tuta | No [95] | No | No | No | SSL, DANE | No | ? |
Yahoo! Mail | Most countries or YPOPs! | Yes [lower-alpha 3] | Yes | No | SSL [97] | No | ? |
Yandex Mail | Appears to require phone number to enable IMAP | Yes | ? | No | SSL, TLS | No | ? |
Zoho Mail | Paid [85] | Paid | ? | No | SSL | Partial | ? |
How much information users must provide to verify and complete the registration when opening an account (green means less personal information requested):
Product | SMS verification | Secondary email verification |
---|---|---|
AOL Mail | Yes | Unknown |
FastMail | Yes | No |
Gmail | Yes | Optional |
GMX Mail (gmx.com) | Yes [98] | Yes [98] |
Hushmail | Yes [99] | Yes [99] |
iCloud | Unknown | Unknown |
Laposte.net | Optional | Optional |
Lycos | Yes | No |
Mail.com | Yes | No |
Mailbox.org | No | No |
Mail.ru | Yes | Unknown |
Mailfence | No | Yes |
Outlook.com | No | Yes |
Proton Mail | Optional [lower-alpha 1] | Optional [lower-alpha 1] |
Rediffmail | Yes | Yes |
Seznam.cz | Yes | Unknown |
Skiff | No | No |
Tuta | No | No |
Yahoo! Mail | Yes | No |
Yandex Mail | Yes [lower-alpha 2] | Unknown |
Zoho Mail | Yes | Yes |
Features to reduce the risk of third-party tracking and interception of the email content; measures to increase the deliverability of correct outbound messages.
Product | Anti-interception | Outbound anti-spoofing and deliverability | Other [lower-alpha 3] | |||
---|---|---|---|---|---|---|
STARTTLS (outbound) [lower-alpha 4] | STARTTLS (inbound) [lower-alpha 5] | Tracking content prevention [102] | Basic SPF [lower-alpha 6] | Default DKIM [lower-alpha 7] | ||
AOL Mail | No [103] | ? | ? | ? | ? | ? |
FastMail | Yes [104] | Yes [104] | Yes [105] | Yes | Yes [106] | ? |
Gmail | Yes | Yes | Partial (only images) [102] [lower-alpha 8] | Yes | Yes | Adds ARC, does not enforce DMARC rejection for Gmail. [107] |
GMX Mail (gmx.com) | ? | ? | ? | Yes | ? | ? |
Hushmail | ? | ? | ? | ? | ? | ? |
iCloud [lower-alpha 9] | ? | Yes [108] | ? | ? | ? | ? |
Laposte.net | ? | ? | ? | ? | ? | ? |
Lycos | ? | ? | ? | ? | ? | ? |
Mail.com | ? | ? | ? | ? | ? | ? |
Mail.ru | ? | Yes [108] | ? | ? | ? | ? |
Mailbox.org | Yes [109] | Yes | ? | Yes | Yes | ? |
Mailfence | No | Yes [110] | Yes [111] [112] | Yes [113] | Yes | ? |
Outlook.com | Yes [108] | Yes | Yes [102] | ? | ? | Adds ARC [114] |
Proton Mail | ? | ? | Yes (images and pixel tracking) [115] | Yes | ? | ? |
Rediffmail | ? | ? | ? | ? | ? | ? |
Skiff | Yes [116] | Yes | Yes | Yes | Yes | ? |
Tuta | ? | ? | ? | Yes | ? | ? |
Yahoo! Mail | No (yahoo.co.jp) [103] | No (yahoo.co.jp) [103] | ? | Yes | ? | DMARC policies incompatible with most mailing lists. [117] |
Yandex Mail | ? | ? | ? | Yes | ? | ? |
Zoho Mail | ? | ? | ? | ? | ? | ? |
Product | Verified privacy and legal defense [lower-alpha 10] | Verified (possibly) neutral technology | Claimed privacy policies [lower-alpha 11] | Inactivity allowed | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Location | No username recycling | Fully free software webmail | Secure (TLS) webmail | Tor gateway available | Tor browser allowed [lower-alpha 12] | Proxy gateway available | Internet censorship (countries) | HTTP tracking cookies | Personalized ads [lower-alpha 13] | Email tracking [lower-alpha 14] | Information sharing | max inactivity (days) | |
AOL Mail | USA | Unknown | No | Yes (default) | No | Yes | Unknown | Unknown | Unknown | Yes | Yes | Yes | 180 [118] |
FastMail | Australia / USA | No | Partial (Roundcube option) [lower-alpha 15] | Yes (default) | No | Yes | Yes [124] | Unknown | Unknown | No | Unknown | Unknown | Unknown |
Gmail | USA | Yes | No (HTML option, requires proprietary JavaScript [125] for ReCAPTCHA) [126] | Yes (default) | No | Requires Tor users to confirm their identity with SMS | No | Unknown | Yes | Yes | Yes | Yes | 720 from June 1, 2021 [127] |
GMX Mail (gmx.com) | Germany | Unknown | No | Yes | No | Yes | Unknown | Unknown | Unknown | Unknown | No [128] | Unknown | 180 [129] |
Hushmail | Canada | Unknown | No | Yes (default) | No | Yes (2012) [130] | Unknown | Unknown | Unknown | No | Unknown | No | Unknown |
iCloud [lower-alpha 16] | USA | Unknown | No | Yes (default) | No | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown |
Laposte.net | France | Unknown | No | Yes | No | Unknown | Unknown | No | Unknown | Unknown | Unknown | Unknown | |
Lycos | Korea | Unknown | No | Yes | No | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown |
Mail.com | Germany / USA | Unknown | No | Yes | No | Yes | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | 365 (?) [131] |
Mail.ru | Russia | Unknown | No [132] | Yes (default) | No | Yes | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | 365 [133] |
Mailbox.org | Germany | No [134] | Yes [135] | Yes (default) | Yes [136] | Yes | No | No | No | No | No | No | 30 [137] |
Mailfence | Belgium | Unknown | No | Yes (default) | No | Yes [138] | Yes [139] [140] | No | No | No | No | No | 365 [141] |
Outlook.com | USA | Yes | No | Yes (default) | No | Requires Tor users to confirm their identity with SMS | Unknown | Unknown | Unknown | No [128] | Yes | Yes [142] | 720 [143] |
Posteo | Germany | Unknown | Yes (Roundcube) [144] | Yes (default) | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown |
Proton Mail | Switzerland | Yes [145] | Yes [146] | Yes (default) | Yes | Yes | No | Russia | No | No | No | No (blocked in Russia) [147] | 365 (free) forever (paid) [148] |
Rediffmail | India | Unknown | No | Yes | No | Yes | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown |
Skiff | USA | Yes | Yes | Yes | Yes | Yes | No | Russia [149] [150] | No | No | No | No | Unknown |
Tuta | Germany | Yes [151] | Yes (GPLv3 [152] ) | Yes (default) | No | Yes | No | Russia | No | No | No | No (blocked in Russia) [147] | 180 [153] |
Yahoo! Mail | USA | No | No | Yes (default) | No | Yes | Unknown | Unknown | Unknown | Yes | Yes | Yes | 365 [154] |
Yandex Mail | Russia | Unknown | No | Yes (default) | No | Yes | Unknown | Unknown | Unknown | Yes [128] | Yes [128] | Unknown | 2.5 years [155] |
Zoho Mail | USA / India | Unknown | No | Yes | No | Unknown | Unknown | Unknown | Unknown | No | Unknown | Unknown | 180 [156] |
Name | Features |
---|---|
FastMail | One time passwords; [157] spam filter; backscatter detection; [158] deletion of selected attachments. Android and iPhone apps. |
Gmail | Account verification via SMS or voice call in some countries; [159] "Normal" view via Settings; Labels instead of folders; Undo send (implemented as a delayed send) |
Laposte.net | spam filter, deletion of selected attachments, address book and calendar/agenda, import/export features for mails, contacts and calendar events, custom signatures for each alias, filters (custom rules) for organizing your emails, holiday mode (auto-response), mobile app for smartphones, integration with Digiposte (a virtual safe-deposit box that allows you to safely archive all your documents in a secured place, including legal documents). |
Mailfence | Client-side encryption with email expiration, Digital signatures, Full OpenPGP inter-operability and support, Integrated account keystore, Multiple PGP keypair support, Public keyserver connection, Full reversibility and key revocation, [160] Full email-suite, Shared mailbox and collaboration with group members |
Outlook.com | One-time password, Mobile alerts, Account verification via SMS or voice call in some countries, Rules, [161] Scheduled Cleanup, [161] Filter to e.g. only see newsletters or Emails from contacts, [161] Recover deleted emails; [162] Key encryption for paid accounts [163] |
Proton Mail | Client-side encryption, email expiration, automatic encryption for Proton Mail-Proton Mail emails, optional email encryption for messages from Proton Mail to other providers |
Rediffmail | sign-in via Google, Yahoo!, Facebook, Twitter, Mobile Sync; Indrive. |
Tuta | Client-side encryption, automatic encryption of mailbox, automatic encryption of emails between Tuta users, optional email encryption for messages from Tuta to other providers |
Yandex Mail | No ads, email for own domains (Yandex PDD), scheduled email delivery, SMS verification, sign-in via Twitter, VK, Facebook, Google Profile |
Zoho Mail | Email Sharing, Folder Sharing, Collaborating with other users by Chat/ Social media for organization, Filters, Schedule and send emails, reminders, Notes, Tasks, Bookmarks and so on. |
Skiff (email service) | Skiff offers client side encryption, [164] schedule send, undo send, multiple aliases, crypto wallet aliasing, email import, custom signatures, auto replies, and email filters. Skiff Mail also integrates with an end-to-end encrypted work suite with notes, drive storage, and a calendar with video conferencing. |
Service Name | Automatic forwarding | Email client access [lower-alpha 1] | Client email for other server | Integration with IM service | Domain Name customization | Interface script technique | Virus scanning | Filters out emails with executable attachments | Custom "From:" Address | Address modifiers (subaddressing) | Server hosted public keyring (for encryption) | Shared key encryption | Zero-knowledge architecture |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
AOL Mail | No | Yes (POP3, IMAP, SMTP) | Yes [lower-alpha 2] | AOL Instant Messenger | No [lower-alpha 3] | JavaScript/ Ajax | Yes (McAfee) | No | Yes | ? | No | No | No |
FastMail | Yes | Yes (POP3, IMAP, SMTP) | Yes (POP3 only) | No (XMPP until 2016-01-31 [165] ) | Some paid plans only | HTML/ JavaScript/ CSS/AJAX | Yes | Configurable with user filtering rules | Yes | Plus addressing and subdomain addressing [166] | No | No | No |
Gmail | Yes | Yes (POP3, IMAP) SSL/TLS supported SMTP restricted [lower-alpha 4] | Yes (POP3 only) | Google Talk beta (XMPP), AOL Instant Messenger | Via Google Workspace, premium plans only | HTML/ JavaScript/ AJAX [lower-alpha 5] | Yes | Yes, including .exe files in zip files | Yes, limited. Feature restricted to preconfigured addresses. Addresses not registered in advance with Gmail are blocked. | Plus addressing | No | No | No |
Hushmail | Business accounts only | Extra cost [lower-alpha 6] | ? | No | Business accounts only | HTML/ JavaScript/ AJAX | Yes | ? | Yes, unlimited email aliases for paid subscribers | No | Yes | Yes | No |
iCloud | ? | POP, IMAP, SMTP SSL/TLS supported | ? | ? | iCloud+ subscribers only [167] | ? | Yes | ? | ? | Plus addressing [168] | ? | ? | No |
Laposte.net | No | Yes (POP3, IMAP, SMTP) SSL/TLS supported | Yes (POP3, IMAP) SSL/TLS supported | No | No | user can choose between HTML or Ajax | Yes | ? | Yes (max. 6 alias per email account) | No | No | No | No |
Mail.com | Premium accounts only | Premium plans only (POP, IMAP, SMTP SSL/TLS supported) | Yes (POP3 only) | Google Talk (XMPP) | No | HTML/ JavaScript/ AJAX 2 [ broken anchor ] | Yes | Yes, including .exe files in zip files | Yes | No | No | No | No |
Mail.ru | Yes | Yes (POP3, IMAP) | Yes (POP3, IMAP) | ICQ, Custom | Yes (Free, Mail.ru for Business supports up to 5000 mailboxes) | HTML/ AJAX (Beta) | Yes (Kaspersky) | ? | Yes | ? | No | No | No |
Mailfence | Paying accounts only | Paying accounts only (SMTP, POP3, IMAP, Exchange ActiveSync), DAVx supported | Yes | XMPP [lower-alpha 7] | Paying accounts only | HTML/ AJAX | Yes | Yes, including .exe files in zip files | Paying accounts only | Plus addressing [169] | Yes | Yes [170] | No |
Outlook.com | Yes | Yes (POP3, SMTP, IMAP, [171] Microsoft Exchange Server) | No (No POP3, but Gmail sync allowed for paid customers [172] ) | Skype, Google Hangouts, Facebook Chat | Via Office 365, some premium plans only | HTML/ JavaScript/ CSS/AJAX | Yes | Yes, including .exe files in zip files | Yes | Plus addressing [173] | Via Office 365 | Via Office 365 | No |
Proton Mail | No | Premium plans only through Proton Mail Bridge [174] | No | No | Premium plans only | JavaScript/AJAX | Yes (ClamAV) | No | Yes | Plus addressing | Yes | Yes | Yes |
rediff | No | Premium plans only | ? | Rediff Bol | Yes | JavaScript/ AJAX 2 [ broken anchor ] | Yes | ? | Yes | ? | No | No | No |
Seznam.cz | Yes | Yes (POP3, IMAP, SMTP) SSL/TLS supported | Yes (POP3 only) | No | Yes | HTML/ JavaScript | Yes (ESET-NOD32) | ? | Yes | ? | No | No | No |
Tutanota | No | No | ? | No | Premium plans only | JavaScript | No | No | Yes | No | Yes | Yes | Yes |
Yahoo! Mail | Premium plan only [lower-alpha 8] | POP3-Plus members only, but free in some countries, IMAP SSL/TLS supported | Yes (POP3 only) | Yahoo! Messenger | Premium plan only | HTML/ JavaScript/ CSS/AJAX | Yes (Norton AntiVirus) | Yes, including .exe files in zip files | Yes & only 10 addresses | Plus addressing (using "-" only) | No | No | No |
Yandex Mail | Yes | Yes (POP3, IMAP, SMTP, SSL) | Yes (POP3 only) | Ya Online, any XMPP IM | Yes (Free, Yandex PDD supports up to 1000 mailboxes without verification of legal use) | HTML/ JavaScript/ CSS/AJAX | Yes (Dr.Web [176] ) | Configurable or/and if discarded by antivirus | Yes, only from confirmed addresses [177] | Plus addressing [178] | No | No | No |
Zoho Mail | Yes if you use Zoho domain, if you use your own domain then Premium plans only [179] | Premium plans only (POP, IMAP, SMTP) | Yes (POP) | XMPP, Google Talk, AOL Instant Messenger, ICQ, Yahoo! Messenger | Business plans only, including free plan | AJAX | Yes | ? | Yes | Plus addressing [180] | No | No | No |
Skiff (email service) | No | No | No | No | Premium plan only | JavaScript | Yes | No | Yes | Plus addressing and subdomain addressing [181] | No | No | No |
In computing, the Post Office Protocol (POP) is an application-layer Internet standard protocol used by e-mail clients to retrieve e-mail from a mail server. Today, POP version 3 (POP3) is the most commonly used version. Together with IMAP, it is one of the most common protocols for email retrieval.
Mail is an email client included by Apple Inc. with its operating systems macOS, iOS, iPadOS, watchOS, and visionOS. Mail grew out of NeXTMail, which was originally developed by NeXT as part of its NeXTSTEP operating system, after Apple's acquisition of NeXT in 1997.
An email address identifies an email box to which messages are delivered. While early messaging systems used a variety of formats for addressing, today, email addresses follow a set of specific rules originally standardized by the Internet Engineering Task Force (IETF) in the 1980s, and updated by RFC 5322 and 6854. The term email address in this article refers to just the addr-spec in Section 3.4 of RFC 5322. The RFC defines address more broadly as either a mailbox or group. A mailbox value can be either a name-addr, which contains a display-name and addr-spec, or the more common addr-spec alone.
Gmail is the email service provided by Google. As of 2019, it had 1.5 billion active users worldwide, making it the largest email service in the world. It also provides a webmail interface, accessible through a web browser, and is also accessible through the official mobile application. Google also supports the use of third-party email clients via the POP and IMAP protocols.
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Outlook.com, formerly Hotmail, is a free personal email service offered by Microsoft. This includes a webmail interface featuring mail, calendaring, contacts, and tasks services. Outlook can also be accessed via email clients using the IMAP or POP protocols.
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myMail is a mobile app for managing multiple email accounts created by My.com, a subsidiary of Mail.Ru Group. Using POP/IMAP, SMTP and Microsoft Exchange ActiveSync protocols, myMail provides real-time, customizable notifications, data compression for sending/receiving email traffic and search functionality.
Proton Mail is a Swiss end-to-end encrypted email service founded in 2013 headquartered in Plan-les-Ouates, Switzerland. It uses client-side encryption to protect email content and user data before they are sent to Proton Mail servers, unlike other common email providers such as Gmail and Outlook.com. The service can be accessed through a webmail client, the Tor network, Windows, macOS and Linux (beta) desktop apps and iOS and Android apps.
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Tuta, formerly Tutanota, is an end-to-end encrypted email app and a freemium secure email service. The service is advertisement-free; it relies on donations and premium subscriptions. As of June 2023, Tutanota's owners claimed to have over 10 million users of the product. The company announced a transition to 100% renewable electricity in March 2019. This decision coincided with employee participation in Fridays for Future protests. On 1st October 2024, Tuta launched its standalone encrypted calendar app. Tuta Mail has recently integrated post-quantum cryptography features through its new protocol - TutaCrypt replacing standard encryption methods like RSA-2048 and AES-256 for its newly created accounts after March 2024.
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Brand Indicators for Message Identification, or BIMI, is a specification allowing for the display of brand logos next to authenticated e-mails.
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