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I have full root access to a linux server and I need to check the mail logs, but I have no idea how. Here is what I was told of why the server is having issues (what I need to check):
It appears that our mail servers are currently blocking your server because of the large number of messages you are sending to them. I checked the log and I am showing that there are currently sending around 6 emails per second to this
I need to find what those emails are (the content of the email etc). Any suggestions?
If your server is used to send 6 emails per second to just one another domain then your server is hijacked with 99.99% certainity and used for spamming. Keeping this server online is a crime. Disconnect your server from internet asap and address the issue.
Sorry but you do not have my sympathy. If you do not know how to drive a car you cannot go to a public highway but you can still drive in your backyard. If you do not know how to manage a server keep it running for yourself and do not connect it to the internet where it poses public danger. Period.
The company pays for the host and the server is located in FL (we are in NY), run by a local tech team. We are a web host company. Whose responsibility is it? I don't have permission to take the server offline.
Ask those people who complained to send you some of these 6-per-second mails with full headers. BTW, chkrootkit is helpful but it won't find all threats. Check if there is still high traffic on port 25.