Results 1 to 3 of 3

Thread: [SOLVED] Proper SMTP config

  1. #1
    Join Date
    Mar 2008
    Rep Power

    Default [SOLVED] Proper SMTP config


    I run Zimbra with my own 3 domains since a couple of months. So far, all mail was relayed through the SMTP servers from my ISP. Since this Friday, my ISP does no more allow senders from non-ISP domains to relay through their SMTP server.

    Therefore, I sent e-mails straight from Zimbra without relay. Unfortunately, the first e-mail I sent was rejected by the recipient server based on their anti spam defense:

    <>: host[999.999.999.999] said: 550
        5.7.1 <>... Mail from refused by RBL,
        RSS, or DUL, please see, sender is (in
        reply to RCPT TO command)
    As my ISP now uses gmail, I tried to relay e-mail through google's smtp server. Mail gets delivered. However, the sender's e-mail address is exchanged with the account used to authenticate. Therefore, any response to such e-mail go back to gmail instead of the origin. Therefore, gmail is not an option.

    What is the proper approach to configure Zimbra and other tools so mail is not refused by RBL, RSS or DUL?

    Further background:
    • I have a dynamic IP address, owned by my ISP
    • Mail is mainly processed by local mail clients

  2. #2
    Join Date
    Nov 2006
    Rep Power


    Unfortunately you are going to have this problem with a lot of MTAs due to being on a dynamic IP address. They will certainly check whether your MX record for your domains do match to the external IP address. As your ISP will not allow you to relay through them you may wish to look at a service like this :- DynDNS :: Mailhop Outbound.

  3. #3
    Join Date
    Mar 2008
    Rep Power

    Default working...

    I signed up for this service and it seems to be working. Thanks for the hint!

Similar Threads

  1. bayes db..
    By osiris in forum Administrators
    Replies: 9
    Last Post: 06-15-2011, 11:14 AM
  2. LDAP Cannot bind on migration to new server
    By neekster in forum Migration
    Replies: 23
    Last Post: 03-09-2009, 02:08 AM
  3. speed up the net
    By mcesari in forum Administrators
    Replies: 10
    Last Post: 04-25-2008, 11:24 AM
  4. need advice on configuring zimbra to work with fax server
    By pheonix1t in forum Administrators
    Replies: 0
    Last Post: 07-11-2007, 07:46 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts