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The format of an email address is local-part@domain, where the local-part may be up to 64 octets long and the domain may have a maximum of 255 octets. [5] The formal definitions are in RFC 5322 (sections 3.2.3 and 3.4.1) and RFC 5321—with a more readable form given in the informational RFC 3696 (written by J. Klensin, the author of RFC 5321) and the associated errata.
Learn how DKIM is an email authentication method that detects forged sender addresses and adds a digital signature to each message. See the technical details of signing, verification, and the DKIM-Signature: header field format.
DMARC is a protocol that protects email domains from unauthorized use and spoofing. It extends SPF and DKIM and defines a policy in DNS to specify how to check and deal with messages that pass or fail the authentication. RFC 7489 defines DMARC as an informational standard.
If you have problems sending AOL Mail, you may need to restart your computer, update your browser, disable pop-up blocker, or reset your firewall. Learn how to fix common sending errors, image challenges, and missing images in this article.
Learn how to troubleshoot common issues with your AOL Mail inbox, such as missing, delayed, or blocked messages, image attachments, and filters. Find out how to contact AOL Customer Care for live support if you need more help.
Get live expert help with your AOL needs—from email and passwords, technical questions, mobile email and more. AOL Mail for Verizon Customers AOL Mail welcomes Verizon customers to our safe and delightful email experience!
Learn about the history, standards, and adoption of international email, which allows email addresses and headers to contain Unicode characters. Find out how international email works with domain internationalization and UTF-8 encoding.
Learn how to use POP or IMAP to download or send emails from your AOL Mail account on a different email app. Find the server settings and instructions for common email apps like Outlook, Gmail, Samsung and more.