SMTP Problem

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Posts: 1
Joined: 29 Oct 2014 22:15

SMTP Problem

Post by piwvh »

I have a vps with Centos 6.5 and postfix installed. When I want to connect to a smtp server like google or mailgun, I get the error 502 command not implemented.
I asked about it and people said it is because of CopFilter. ... mplemented
I wanna know is it true? And if it is, what should I do? I have not installed CopFilter.

And this is what happens:
[root@mail ~]# telnet 25
Connected to
Escape character is '^]'.
220 smtp.passthru
250 smtp.passthru
502 Command not implemented

Posts: 846
Joined: 13 May 2010 22:37
Location: FRANCE

Re: SMTP Problem

Post by ShelbyGT500 »


And welcome on Copfilter Forum ! :D
piwvh wrote:I have not installed CopFilter
You give the answer.
Copfilter is an addon for IPCOP. You don't use IPCOP (firewall) , and not Copfilter , so this is not an issue with them but with your server (check port , gmail port is 587) .



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