SMTP Sending: 550 Relay denied for

I’m receiving email but not sending

smtp-out.log (4.6 KB)

Hello,

From the logs it seems you are connecting to 172.253.62.26 (which seems to be a Gmail MX server) but you are receiving a banner looking like your own Axigen server.

2022-05-29 17:43:08 -0300 08 ubuntu SMTP-OUT:0000000D: Relay mail 232AFA: connecting to 172.253.62.26:25
2022-05-29 17:43:08 -0300 08 ubuntu SMTP-OUT:0000000D: Relay mail 232AFA: connected to 172.253.62.26:25
2022-05-29 17:43:08 -0300 16 ubuntu SMTP-OUT:0000000D: << 220 ubuntu Axigen ESMTP ready

From my side this is what I’m getting when connection to that IP address:

$ telnet 172.253.62.26 25
Trying 172.253.62.26...
Connected to 172.253.62.26.
Escape character is '^]'.
220 mx.google.com ESMTP jl8-20020ad45e88000000b0045ac6173ac7si8260612qvb.194 - gsmtp

So, most probably, you have some networking rules that is preventing you to connect to external mail servers. It is like routing them back to your own server.

HTH,
Ioan