Cyber security, infotech
Some things never change. Love it or hate it, but everyone still needs email.
In order to figure out how many days your letsencrypt certificates have left, you could check an online services such as:
https://www.ssllabs.com/ssltest/index.html
However, that won’t work for a mail server that’s not also running a web server using the same certificate.
In this case, your best bet is to check the certificate file directly using the openssl command as follows:
openssl x509 -noout -dates -in /etc/letsencrypt/live/smtp.yourmailserverdomainname.com/cert.pem
Logs that grow in size uncontrollably can cause unintended consequences. If you keep ignoring the situation, it will only get worse until you run our of disc space, the system starts being unresponsive or processes begin to crash.
Here is how you can improve your Postfix access maps in order to block incoming spam based on sender’s address.
In the universe of email and messaging, change is accelerating. The world of IT came up with a new marketable buzzword with earth-shaking repercussions: Unified Communications.
In order to fish our spammer’s emails and other identifying information, you can use your mail clients’ log files and/or junk email. Here is how to get started.