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  1. #1
    Newbie
    Join Date
    Oct 2021
    Posts
    3

    Arrow SMTP inbound not working

    Hey everyone

    i have an exchange server configured behind my untangle firewall

    i have port forwarded ports 443 and 25 to my exchange server

    i can hit OWA without issue (443) but no mail is coming through. if i try and telnet from the internet on port 25 i just get a connection timed out

    Connecting To mail.tingateit.xyz...Could not open connection to the host, on port 25: Connect failed

    i can telnet internally to the exchange server without issue

  2. #2
    Untangler jcoffin's Avatar
    Join Date
    Aug 2008
    Location
    Lake Tahoe
    Posts
    9,684

    Default

    Has the mail smtp worked with the same ISP before? Most ISPs block port 25 by default. I would check reports for the mail server IP to see if any of the apps are blocking the incoming connection also.
    Last edited by jcoffin; 12-28-2021 at 08:50 PM.
    dashpuppy likes this.
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  3. #3
    Newbie
    Join Date
    Oct 2021
    Posts
    3

    Default

    I have two internet links

    a fixed line, and a business 4g services, have tried via both, same result, i have checked with the fixed line ISP and ocnfirmed 25 inbound is allowed

  4. #4
    Untangle Ninja sky-knight's Avatar
    Join Date
    Apr 2008
    Location
    Phoenix, AZ
    Posts
    26,497

    Default

    Ingress TCP 25 is a port forward that looks identical to your 443 forward. Heck, you could just use a comma separated list for your destination port flag, and do both TCP 443 and 25 in the same rule.

    If you do that, and 443 works while 25 doesn't... your ISP is lying to you.

    TCPDump can prove it, you just have to ask it to watch for dst port 25 while you test. If you see the packets but the service isn't responding well... time to go smack your mail server.
    dashpuppy likes this.
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    NexgenAppliances.com
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