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This is a list of Simple Mail Transfer Protocol (SMTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. Unless otherwise stated, all status codes described here is part of the current SMTP standard, RFC 5321. The message phrases shown are typical, but any human-readable alternative ...
For example, the Delivery Status Notification extension defined in RFC 3461 requires a null return path when sending email with a "NOTIFY=NEVER" option to a non-conforming server. Some e-mail bounces (incorrectly) get sent not to the return address, but to the e-mail address on the From: header.
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 ...
Sendmail is a general purpose internetwork email routing facility that supports many kinds of mail-transfer and delivery methods, including the Simple Mail Transfer Protocol (SMTP) used for email transport over the Internet.
Most email software and applications have an account settings menu where you'll need to update the IMAP or POP3 settings. When entering your account info, make sure you use your full email address, including @aol.com, and that the SSL encryption is enabled for incoming and outgoing mail.
This example shows the simplest possible method of matching a VERP to a list subscriber: the entire recipient address is included within the return path, with the at sign replaced by an equals sign because a return path with two at signs would be invalid. Other encoding schemes are possible.
Check your display name: If you have any combination of "AOL" in your display name, the message won't go through. It is especially important to check your Mail settings for this if your account has been recently compromised, as hackers will often change your name to make it harder for you to use your account normally even after it's secured.
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.