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The Basic Status Codes have been in SMTP from the beginning, with RFC 821 in 1982, but were extended rather extensively, and haphazardly so that by 2003 RFC 3463 rather grumpily noted that: "SMTP suffers some scars from history, most notably the unfortunate damage to the reply code extension mechanism by uncontrolled use.
The SMTP commands sent out are: HELO verifier host name MAIL FROM:<> RCPT TO:<the address to be tested> QUIT Equivalently, the MAIL FROM and RCPT TO commands can be replaced by the VRFY command, however the VRFY command is not required to be supported and is usually disabled in modern MTAs.
A session may include zero or more SMTP transactions. An SMTP transaction consists of three command/reply sequences: MAIL command, to establish the return address, also called return-path, [24] reverse-path, [25] bounce address, mfrom, or envelope sender. RCPT command, to establish a recipient of the message. This command can be issued multiple ...
When you get a message from a "MAILER-DAEMON" or a "Mail Delivery Subsystem" with a subject similar to "Failed Delivery," this means that an email you sent was undeliverable and has been bounced back to you.
You can use a third-party email application to send and receive emails, if you'd prefer a different interface. Below are the server settings you'll need to use and links to common email app setup instructions. If you need specific help configuring your app, please contact its manufacturer. Mail server settings
If you've activated 2-step verification for your AOL account, you'll need to generate and use an "app password" to access AOL Mail from these apps. Check your IMAP settings If your AOL Mail isn't sending or receiving mail properly, you'll need to make sure your IMAP or POP settings are correct .
The requirement to accept mail for postmaster implies that RCPT commands which specify a mailbox for postmaster at any of the domains for which the SMTP server provides mail service, as well as the special case of "RCPT TO:<Postmaster>" (with no domain specification), MUST be supported.
AOL is committed to protecting the privacy and security of our members. To maintain the security of your account while accessing AOL Mail through third-party apps, it's necessary to keep your connection settings updated.