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]
How to test your SPAM and virus filters, e.g. SpamAssassin and ClamAV
How to test your SPAM filter: Send a message with this text: XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X Now check the SPAM folder. How to test your virus filter Download
How to upgrade IMAPSYNC on CentOS 7
Synopsis On CentOS 7 you might get these warnings: # imapsync –dry –host1 x.y.z.a –user1 [email protected] –password1 ‘xxxxxx’ –nosslcheck –host2 b.c.d.f –user2 [email protected] –password2 ‘yyyyyy’
Adding account in Outlook failing with bogus write-protected message
Outlook fails: We couldn’t create the Outlook data file. Make sure the disk you’re saving to isn’t full or write-protected and that the file isn’t
How to automatically reject an email message to a recipient in Postfix
Background To automatically reject an email message using Postfix, you can set up a smtpd_recipient_restrictions rule in the Postfix configuration file located at /etc/postfix/main.cf Why
How to deal with “The message store has reached its maximum size. To reduce the amount of data in this file, permanently delete some items that you no longer need.” looping
Background At times Outlook might start looping for power users. The messages received is: > The message store has reached its maximum size. To reduce
Bogus “Reverse DNS does not match SMTP Banner” using MX Toolbox on a WHM server
Synopsis When testing Email Health using MX Toolbox on a WHM hosted domain, you may get 3 false positives: smtp server.example.com Reverse DNS does not
Outlook Mac error – The total attachment size exceeds the limit. Try removing one or more attachments before saving or sending.
On Outlook for Mac version 2016 connected with IMAP to a Kopano server, you might experience the following: The total attachment size exceeds the limit.
Postfix issue: warning: you may need to increase the main.cf local_destination_concurrency_limit from 2
On a really busy Postfix server you might encounter the following issue: Jan 18 16:41:21 mail postfix/qmgr[1669]: warning: you may need to increase the main.cf
How to change the log file date format on a Virtualmin Postfix server
Background I gave myself this task because I wanted to write an advanced script that can: Extract a ban from fail2ban based on IP address,