Postfix unknown connections

[alasdairc]

Hi all,

Having a few possibly concerning logs on my host, I appear to be getting some random connections made to Postfix. I currently have it set up to "Internet" as I have an SMTP server elsewhere

Jul 30 17:10:27 prmx0 postfix/smtpd[4336]: connect from unknown[103.155.83.201] Jul 30 17:10:28 prmx0 postfix/smtpd[4336]: disconnect from unknown[103.155.83.201] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4


My host is not configured as an SMTP open relay - is this something to worry about?


Thank you

 

[ph0x]

Educate yourself in internet and server security and power off that postfix NOW!

 

[alasdairc]

Educate yourself in internet and server security and power off that postfix NOW!

That's not very helpful

I don't see what the problem is the problem is considering it's not an open relay, it's STARTTLS and Auth'ed, would be helpful if you could explain what the log actually means instead of talking down on me

 

[alasdairc]

Educate yourself in internet and server security and power off that postfix NOW!

It's just "noise", it's nothing to worry about after doing some investigation. My security is strong enough to not allow spam/spam forwarding, un-authed users...

Be nicer

 

[Dunuin]

Why do you set it up as "Internet" at all if you are conecting to another SMTP Server to send mails? If you just want to send some mails using a relay the mode "Satellite System" would be enough.

 

[alasdairc]

Why do you set it up as "Internet" at all if you are conecting to another SMTP Server to send mails? If you just want to send some mails using a relay the mode "Satellite System" would be enough.

Interesting point, thank you - so essentially, I have a fully-fledged SMTP server sending to another fully-fledged SMTP server, I see that doesn't make sense

https://askubuntu.com/questions/133...e-internet-with-smarthost-satellite-system-sh