Topic: telnet to port 25
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Hi zhang, one of my clients were having trouble setting up their email client with starttls configuration so I went ahead and edited the dovecot.conf file with the following
The problem I am not sure if my mail server is now an open relay or not? Before I edited dovecot, I wasn't able to telnet port 25 of the server from the public internet. But now, I tried to telnet port 25 and I am able to login (although from two different ISP, one is not able to login, one is not).
How am I sure that our mail server is not an open relay?