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Postfix timeout after DATA (0 bytes) on either smtp or submission port

If you get the following error in your Postfix log file, and email clients just appear to be hanging (e.g. stuff in Outbox): Aug 3

How to whitelist a domain in Virtualmin that is being delayed by Greylisting all the time

Background Greylisting is a common technique to keep once-off spammers away from a mail server. By using timing and a triplet system based on sender

Mac computer repeatedly prompts for password but small print is about maximum number of connection from user+IP exceeded mail_max_userip_connections=10

When you have these symptoms: Mac computer repeatedly prompts for password but small print is about maximum number of connection from user+IP exceeded mail_max_userip_connections=10 This

Newly installed Virtualmin server, email sending repeatedly prompts for password

On a freshly installed Virtualmin server strange behavior in terms of email sending. Everything looks perfect on port 465 and 587, but sending clients are

Basic guide to set up DMARC on a WHM / cPanel server

DMARC is actually quite easy, because it’s just a TXT record. There are a multitude of options, so best to choose some intelligent defaults to

How to delete messages from the Sendmail queue

First check the size of the queue: # mailq | tail -n 1 Total requests: 35971 Use this command to delete the mess: find .

What to do when you get warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory

If you get the problem below, trimmed and highlighted in bold: SASL authentication failure: cannot connect to saslauthd server At least run the command below

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