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Relay not permitted DROP in ACL

Bernhard Held

hi altogether, 

I have a problem which I am trying to solve all day long now. I have setup SMTP Protection and outbound it works perfectly - inbound no chance to make it running - I always receive this error message:

2021:06:16-16:45:18 core exim-in[5643]: 2021-06-16 16:45:18 SMTP connection from [178.x.x.x]:55240 (TCP/IP connection count = 1)

2021:06:16-16:45:18 core exim-in[30965]: 2021-06-16 16:45:18 H=mail.x.x [178.x.x.x]:55240 X=TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256 CV=no F=<a.b@c.d rejected RCPT <administrator@d.f>: Relay not permitted
2021:06:16-16:45:18 core exim-in[30965]: 2021-06-16 16:45:18 SMTP connection from mail.x.x [178.x.x.x]:55240 closed by DROP in ACL
when I implement a NAT rule which sends the traffic directly to Exchange, everything works - so the error has to be on the Sophos UTM. I have tried multiple settings in the relay tab with no result. Right now I only have the internal ip of the Exchange with rdns on the official DNS at the Host Based Relay Tab under Allowed / Hosts Network. 
Does anyone has an idea what the reason for this could be?

Thank you very much in advance, 
best regards, 

Bernhard


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  • FormerMember
    0 FormerMember

    Hi ,

    Thank you for reaching out to the Community!
    What did you configure under Email Protection > SMTP > Domains? If you added *company.com, then remove the * and save the configuration and let us know if that helps.

    Thanks,

Reply
  • FormerMember
    0 FormerMember

    Hi ,

    Thank you for reaching out to the Community!
    What did you configure under Email Protection > SMTP > Domains? If you added *company.com, then remove the * and save the configuration and let us know if that helps.

    Thanks,

Children
  • 0 in reply to FormerMember

    Hi Harsh, 

    thanks for your response - I have read all threads I was able to find about this topic. And of course I don't use the * in my domains. That is the reason why I wrote here, I tried to find a solution all day with this forum, other sources (like Frankysweb from Germany). 

    And as you can see, inbound outbound traffic works (at least with NAT rule) but I just would like to get that inbound mails also checked. 

    My personal suspicion is the weird setup of ip addresses and nets with Hetzner provider. I have a public ip where my ESXI is reachable - over this ip there is another subnet routed - the one where my sophos lies and behind the sophos there is my Exchange. And I am pretty sure that might be the reason but all of my ideas didn't help with IP Adresses as allowed relay or whatsoever.

    Maybe somebody has a great idea to help me?

    TIA Bernhard

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