Wrong SSL certificate interfering with Outlook and Virtualmin IMAP/SMTPS
This morning an old established client tell me he has been getting certificate warnings, and lately a lot of problems sending email. After some time
Repeating ‘received a response that is not DNSSEC validated’ messages on a fresh Virtualmin Ubuntu 22.04 server
You might see these repeating messages on a newly perfectly installed Virtualmin server: Jun 1 06:44:36 host postfix/smtp[104754]: warning: reason: dnssec_probe ‘ns:.’ received a response
Proxmox Mail Gateway Quick Start Guide
Introduction Writing a quick start article for an anti-spam gateway is not trivial. The fact of the matter is everyone’s idea on how to use
Mac OS X El Capitan can’t send messages on port 465 SSL nor 587 STARTTLS
Welcome to old operating system support! In today’s edition you’ll find older operating systems don’t work properly with modern and secure and up to date
How to deal with a Let’s Encrypt certificate expiration notice for domain “example.com” on a Kopano / Generic system
Let’s Encrypt expirations can be a nightmare on unautomated systems. When it goes wrong on an automated systems it’s even worse. The bot will try
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]
Outlook stuck on send/receiving synchronizing folder
This problem occurs on larger mailboxes. The issue means you can’t really send stuff anymore. Sometimes restarting the PC works. Googling this is really hard.
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’
How to monitor an Exim queue on a WHM server using SNMP and PRTG
This technique uses an HTTPS connection and PRTG’s integer type to keep track of the queue size. You have to pick a “static” site on