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Thread: SMTP Auth Issues/ soooo Confused.

  1. #1
    Join Date
    Jul 2010
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    Default SMTP Auth Issues/ soooo Confused.

    I have atempted to enable SMTP Auth simply by checking the box, and I confirmed this by running the command.

    [zimbra@host ~]$ zmprov getServer | grep Auth
    zimbraMtaAuthEnabled: TRUE
    zimbraMtaAuthURL: MyDomain | Domain Names, Web Hosting, and Free Domain Services /service/soap/
    zimbraMtaTlsAuthOnly: FALSE
    [zimbra@host ~]$

    I can easily access mail to my server via port 25 which I though would change to port 587. when attempting to sent mail via port 587 it gives me an error.

    [root@host ~]# telnet 587
    telnet: connect to address Connection refused
    telnet: Unable to connect to remote host: Connection refused
    [root@host ~]#

    and successfull if I used port 25

    [root@host ~]# telnet 25
    Connected to (
    Escape character is '^]'.
    220 **********************************

    is there some other setting I need to configure, I don't understand how this is supposed to work. There is no firewall running on the server. I have Itables turned off. and there is no services i can see running on port 587 when i netstat -a and grep for the port.
    any help would be appreciated.

  2. #2
    Join Date
    Jun 2008
    Berkeley, CA
    Rep Power


    I don't have any experience with ZCS 4.5 or earlier, so YMMV.

    That said I believe that ZCS 5 and earlier do not use port 587. Instead they use port 465 for authenticated/secure SMTP. You should be able to verify which ports are open using nmap or a similar tool. There is a way to enable port 587; search the forums and wiki for info.

    Even with secure/authenticated connections enabled, SMTP will still exist on port 25 because that's always allowed/needed for mail that meets these criteria:

    1. Not delivered from a trusted network.
    2. Final destination is a local domain.

    In other words: mail coming from external mail servers, as long as no attempt is made to relay to external addresses.

  3. #3
    Join Date
    Jul 2010
    Rep Power

    Default Um

    Thanks for the reply, I will look into this.
    Last edited by Johnny19; 08-26-2010 at 12:38 PM.

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