Lost connection while performing the HELO handshake

Discussion in 'ISPConfig 3 Priority Support' started by Hans, Mar 20, 2023.

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  1. Hans

    Hans Moderator Moderator

    Long time no see, because i can help myself but not this time.

    I've setup a whole new server with ISPConfig 3.2.9p1 on Debian 11. I installed it automatically with the auto installer.
    Everything works great, but i got a nasty problem.
    E-mails can't be sent to the mail server of a huge Dutch Internet Provider.
    This is the error message i got:
    (lost connection with mxin10.ziggo.nl[212.54.42.8] while performing the HELO handshake)
    What can i do to solve it?

    For your information:
    On the moment i also have an older ISPConfig server. I don't have this issue on that server.
     
    Hans, Mar 20, 2023
    #1
  2. Th0m

    Th0m ISPConfig Developer Staff Member ISPConfig Developer

    Indeed long time no see!

    What is the output of
    Code:
    hostname -f
    ? And
    Code:
    cat /etc/mailname
    ?
     
    Th0m, Mar 20, 2023
    #2
  3. Hans

    Hans Moderator Moderator

    Thank you for your support Th0m,

    The output of hostname -f : my.mrhostman.nl
    The output of cat /etc/mailname: my.mrhostman.nl

    It's both the fqdn and correct.
     
    Hans, Mar 20, 2023
    #3
  4. Hans

    Hans Moderator Moderator

    I do need to solve this issue. Any other suggestions?
     
    Hans, Mar 21, 2023
    #4
  5. till

    till Super Moderator Staff Member ISPConfig Developer

    Do you have this issue with other email providers as well? if not, send the postmaster of that provider an email and ask for help. Your new server might be on some IP blacklist that he uses and he might be able to help you to find out why he rejects the connection after helo. Also, double-check that the DNS setup for your hostname is correct for IPv4 and IPv6.
     
    till, Mar 21, 2023
    #5
  6. Hans

    Hans Moderator Moderator

    Hi Till,

    I hope you are doing fine. I am a happy ISPConfig user still and i love the migration and billing plugin.You are completely right so here is my update:

    The problem is solved.
    The IP i received from the DC was on the ISP blocking list, but they removed the IP from their blocking list. Everything works perfectly fine now.

    Thanks anyway and keep up the good work!
     
    Hans, Mar 21, 2023
    #6
    till likes this.

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