Tag Archives: relay

Relay that is not….

So it looks like relay, but it is not. Seen from outside, it looks like it comes from a local mail address, but IP is somewhere in China, and it sends to (obviously) spam addresses : Mar 16 18:34:02 mail-2012 … Continue reading

Posted in Linux | Tagged | Comments Off on Relay that is not….

Is your mail server a (open) relay?

Here is how you can test it : Test 1 From another server log onto your mail server, using its outside IP address (or name) : # telnet outside-IP 25 Trying outside-IP… Connected to mail-2012.my.domain (outside-IP). Escape character is ‘^]’. … Continue reading

Posted in Linux | Tagged , | Comments Off on Is your mail server a (open) relay?

How to check if your mail server is a open relay

All is done from a PC that is not inside of your network, so you are accessing your server through its public IP. From command line you do this : # telnet public-IP-of-server 25 – type Trying public-IP-of-server… Connected to … Continue reading

Posted in Linux | Tagged , | Comments Off on How to check if your mail server is a open relay