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X.3.XXX Mail System Status; X.4.XXX Network and Routing Status; X.5.XXX Mail Delivery Protocol Status; X.6.XXX Message Content or Media Status; X.7.XXX Security or Policy Status; The meaning of the "detail" field depends on the class and the subject, and are listed in RFC 3463 and RFC 5248.
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. These messages are sent automatically and often include the reason for the delivery failure.
Greylisting is effective against mass email tools used by spammers that do not queue and reattempt mail delivery as a regular mail transport agent normally does. Delaying delivery also gives real-time blackhole lists and similar lists the time to identify and flag the spam source. Thus, these subsequent attempts are more likely to be detected ...
Delivery records in the full headers show when each computer received the message. The first delivery is at the bottom; the newest at the top. If you find a large time gap between delivery records, that shows which computer delayed before sending it to the next computer. 1. View the full header as described above. 2.
If you're repeatedly getting delivery failure errors when sending messages to AOL Mail customers, it is most likely due to spam blocking on AOL's servers. While you may be following at the rules for sending mail, it's likely the address you're sending mail from is hosted on a server our system had identified as "abusive".
If your Mail settings don't have Rich Text or HTML enabled, you could have problems with viewing images in forwarded emails. These settings can be enabled from the Mail Settings page. Send image as an attachment: If you've sent an image in an email, but your recipient didn't receive it there may have been a problem with the way the file was sent.
To permit an intermittently-connected mail server to pull messages from a remote server on demand, SMTP has a feature to initiate mail queue processing on a remote server (see Remote Message Queue Starting below). POP and IMAP are unsuitable protocols for relaying mail by intermittently-connected machines; they are designed to operate after ...
Delivery records in the full headers show when each computer received the message. The first delivery is at the bottom; the newest at the top. If you find a large time gap between delivery records, that shows which computer delayed before sending it to the next computer. 1. View the full header by following the steps above. 2.