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Thread: SMTP authentication for local emails

  1. #1
    extremal is offline Active Member
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    Default SMTP authentication for local emails

    Hi All,
    I have a problem and the problem is that my emails are being spammed with local accounts. In my current installation I have 5 domains on my server and when you send email from one user to another user of the same domain SMTP authentication is not required. I think because of that I am receiving a lot of spam mails.
    How can I enable autentication for my SMTP even for local accounts to stop that spamming and do not affect normal email usage? How can I validate senders mail addresses and stop spooffing?

    thanks,

  2. #2
    uxbod's Avatar
    uxbod is offline Moderator
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    Have you had a read through ? Wiki :: Improving Anti-Spam System

    What do you have for
    Code:
    su - zimbra
    zmprov gcf zimbraMtaRestriction
    Last edited by uxbod; 01-13-2009 at 01:54 AM.

  3. #3
    extremal is offline Active Member
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    Default .

    Thanks for your reply,
    No actually I haven't read it.
    here's output :
    [root@mail ~]# su - zimbra
    [zimbra@mail ~]$ zmprov gcf zimbraMtaRestriction
    zimbraMtaRestriction: reject_invalid_hostname
    zimbraMtaRestriction: reject_non_fqdn_sender

  4. #4
    uxbod's Avatar
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    It would also be worth adding in some RBLs. Personally I have the following config
    Code:
    [zimbra@office ~]$ zmprov gacf | grep -i mtarestriction
    zimbraMtaRestriction: reject_non_fqdn_sender
    zimbraMtaRestriction: reject_invalid_hostname
    zimbraMtaRestriction: reject_rbl_client b.barracudacentral.org
    zimbraMtaRestriction: reject_rbl_client zen.spamhaus.org
    zimbraMtaRestriction: reject_rbl_client dnsbl.sorbs.net
    for the barracuda RBL you would need to sign up for free at Barracuda Central.

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