telnet to port 25 on mail server hangs for over 1 minute before responding with 220
My mail server was working great two days ago. something changed over night. Now when I telnet 10.0.0.4 25 the system hangs for over a minute before it gives me a 220 message.
I suspected DNS was the issue and that's why I used the IP address. If I telnet to localhost 25 on the mail server, it is very quick, but if I telnet 10.0.0.4 25 or telnet mailhostname 25 it hangs for just over 1 minute before giving me a 220 message.
- I can ping mailhostname and get quick responce, I'm thinking it's a sendmail configuration issue...
8/22/2022 - Mon
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