December 2017
Intermediate to advanced
410 pages
11h 5m
English
One fine evening, my friend called and informed me that he got an email from his cloud hosting provider related to an abuse complaint. It stated that the server was found to be one of the spam emitters and has been blacklisted by spam bots and email services:

It was a very strange email because that website never really used to send emails. Once we logged in to the server, we analyzed that every day there were thousands of emails which were being sent from the server. Postfix was also installed and tens of thousands of emails were in the queue. In fact, there were so many messages in the email queue that entire ...
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