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SMTP Connection LOCAL/outside

VenimK

UTM Ver. 9.412-2

 

Been playing around with SMTP Proxy and pop3 proxy
SMTP proxy works outside my localnetwork OK

Telnet mynoip.domain.com 587
or with mail client works

But when i try this this on a local machine it get.

telnet mynoip.domain.com587
Trying XX.XX.XX.XX...
telnet: connect to address XX.XX.XX.XX: Connection refused
telnet: Unable to connect to remote host

in mail client i've hve to enter the sophos IP, and can not use my domain name

 

Is this how it works, or am i missing something



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  • 0

    Does it work with your external or your internal IP? I would guess last one matches.

    You can not connect to an external FQDN, that resolves to your own public IP. In those cases you need a split brain DNS entry in your local DNS zone. That entry resolves the FQDN to a local IP and everything is fine.

    Gruß / Regards,

    Kevin
    Sophos CE/CA (XG+UTM), Gold Partner

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  • 0

    Does it work with your external or your internal IP? I would guess last one matches.

    You can not connect to an external FQDN, that resolves to your own public IP. In those cases you need a split brain DNS entry in your local DNS zone. That entry resolves the FQDN to a local IP and everything is fine.

    Gruß / Regards,

    Kevin
    Sophos CE/CA (XG+UTM), Gold Partner

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  • 0 in reply to kerobra_retired

    Kevin is quite right here. When your client is internal, if you do a dns lookup, you will find it resolves to the external ip address.

    What you need to do is add a zone into you dns server that is the same as the external domain and then add the UTM as an A record.

    That way, when the clients are internal, they will resolve to the internal ip of the UTM and when they are external, they will resolve to the external ip.

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