DirectAdmin users are referred to this page if they report (a) problems sending outgoing email or (b) delayed incoming email.
Recently, we enabled greylisting and black lists in the DirectAdmin environment to keep spam out.
If you are using a POP or IMAP mail client, and you attempt to send outgoing mail through the DirectAdmin server, the server remembers from which IP address you checked your incoming mail. It will then let you send outgoing mail from the same IP address without any of the anti-spam mechanisms being applied against the email you send. This works best if your mail client always checks incoming mail before sending outgoing mail; otherwise the server may fail to recognize you as a client when you try to send outgoing mail.
For better results results, make sure you are sending mail using authenticated SMTP and connecting to port 587. Your mail client should have a configuration option to enable this. Then you will be sending mail as an authenticated sender. The server will always recognize you as a customer and will let you send outgoing mail without imposing any anti-spam mechanisms on the mail you are sending.
Delayed mail occurs normally as a consequence of greylisting when a new sender sends you mail for the first time. Possible solutions are discussed on the greylisting page referenced below.
To read more about greylisting and black lists please see:
Also, if you are unsure as to how to keep track of announced system changes, please see:
This document is: http://faq.rahul.net/cgi-bin/fom.cgi?file=66
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