Outbound SMTP issue

[q__nt_n]

Hi,
I want to used my contabo VPS with Cloudron as Build-in SMTP server for one of my domains.
But I have this issue :

I contacted Contabo support who told me that port 25 was not blocked on their VPS and to test commands

netstat -tulpen

This is result :

From what I understand, port 25 is indeed listening... but that still doesn't allow it to be used as an email server.

Could you help me please ?

Thanks

[girish]

@q__nt_n Issue is not listening to port 25 but connecting to outbound port 25.

Just SSH into your server and run telnet port25check.cloudron.io 25 . Does it connect ? Output should be like this:

~# telnet port25check.cloudron.io 25
Trying 165.227.67.76...
Connected to api.cloudron.io.
Escape character is '^]'.
works
Connection closed by foreign host.

[q__nt_n]

@girish
It's not working

[girish]

@q__nt_n The VPS blocks port outbound 25. You have to reach out to contabo again and tell them that you can't connect with the above command.