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Thread: Zimbra being an open relay?

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  1. #1
    Join Date
    May 2007
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    Angry Zimbra being an open relay?

    Running Zimbra Open Source version, and about to install the Network trial, but a security scan pointed out that the Zimbra system is acting as an open relay.

    Zimbra is configured to send all mail through an external SMTP server.

    Doing a simple open relay test confirms that Zimbra is happily relaying any mail it gets. (Telnet to SMTP port, MAIL FROM: , RCPT TO: , DATA, some text, and off it goes.)

    Why is Zimbra relaying mail for everything? Even if I tell Zimbra to use an external SMTP server for all outgoing mail, it should still only be accepting mail for the domains that it's configured for.

    zimbra.log output for the test message is below. Please let me know if there's anything else I can provide to help diagnose this.

    HTML Code:
    Jun 29 09:15:50 zimbraserver postfix/smtpd[13993]: 8F77870048: client=tachikoma.ourdomain.tld[AAA.BBB.CCC.31]
    Jun 29 09:16:11 zimbraserver postfix/cleanup[13994]: 8F77870048: message-id=<20070629161550.8F77870048@zimbraserver.ourdomain.tld>
    Jun 29 09:16:11 zimbraserver postfix/qmgr[28445]: 8F77870048: from=<user@externaldomain.tld>, size=404, nrcpt=1 (queue active)
    Jun 29 09:16:11 zimbraserver postfix/smtpd[27396]: 9EB5F7003C: client=localhost[127.0.0.1]
    Jun 29 09:16:11 zimbraserver postfix/cleanup[27136]: 9EB5F7003C: message-id=<20070629161550.8F77870048@zimbraserver.ourdomain.tld>
    Jun 29 09:16:11 zimbraserver postfix/qmgr[28445]: 9EB5F7003C: from=<user@externaldomain.tld>, size=1063, nrcpt=1 (queue active)
    Jun 29 09:16:11 zimbraserver amavis[27303]: (27303-04) FWD via SMTP: <user@externaldomain.tld> -> <user@externaldomain.tld>, BODY=8BITMIME 250 2.6.0 Ok, id=27303-04, from MTA([127.0.0.1]:10025): 250 Ok: queued as 9EB5F7003C
    Jun 29 09:16:11 zimbraserver amavis[27303]: (27303-04) Passed CLEAN, [AAA.BBB.CCC.31] [AAA.BBB.CCC.31] <user@externaldomain.tld> -> <user@externaldomain.tld>, Message-ID: <20070629161550.8F77870048@zimbraserver.ourdomain.tld>, mail_id: 1zldVdAwLx+r, Hits: -0.825, queued_as: 9EB5F7003C, 336 ms
    Jun 29 09:16:11 zimbraserver postfix/smtp[27143]: 8F77870048: to=<user@externaldomain.tld>, relay=127.0.0.1[127.0.0.1], delay=27, status=sent (250 2.6.0 Ok, id=27303-04, from MTA([127.0.0.1]:10025): 250 Ok: queued as 9EB5F7003C)
    Jun 29 09:16:11 zimbraserver postfix/qmgr[28445]: 8F77870048: removed
    Jun 29 09:16:11 zimbraserver postfix/smtp[27615]: 9EB5F7003C: to=<user@externaldomain.tld>, relay=cse-smtp.ourdomain.tld[AAA.BBB.CCC.63], delay=0, status=sent (250 Ok: queued as AE3162C14C)
    Jun 29 09:16:11 zimbraserver postfix/qmgr[28445]: 9EB5F7003C: removed
    Last edited by gkra; 06-29-2007 at 10:56 AM. Reason: formatting fixup

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