How to mass delete email from a specific sender using Dovecot (expunge)
Here is the command to mass delete a message from a Dovecot mailbox: doveadm expunge -u [email protected] mailbox Inbox FROM [email protected]
spam
How to use an SSH tunnel and a SOCKS proxy to browse via another Linux box
Background Certain mail black delisting services such as Project Honeypot requires you to access their delisting page from the IP address of the machine that
Fighting SPAM with Exim on WHM/cPanel
Background WHM/cPanel has the excellent MTA called Exim. The default settings are pretty good for keeping SPAM away, but every now and again a particularly
How to gain control over a postfix server by deleting all messages in the queue at once
If your postfix server is running away and it’s chaos because there are 1000s or millions of messages in the queue, your only recourse might
Virtualmin is slow due to clamscan and spamassassin
Your Virtualmin GPL server has crawled to a halt. Whilst doing a ‘top’ you see repeated events of CLAMSCAN taking up memory and CPU. You
How does SPF and DKIM work?
SPF SPF records can be added easily by just adding a new TXT record to DNS. But how does the syntax for an SPF record
Why does it take exactly two minutes for my email to get delivered to Gmail’s server?
Quick answer: Greylisting. Long answer: Read this: https://forum.netcup.de/anwendung/sonstige-anwendungen/p82197-warum-ist-sendmail-so-langsam-php-mail/ or summarised: Greylisting: Greylisting refers to a form of spam control for emails, in which the first
How to count / determine the exact amount of messages in a Postfix mail queue
How do I count the message in Postfix’s mail queue? I’m not really interested in all these posts on the internet that outputs the queue.