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Thread: Status - Deferred. SMTP error 451

  1. #1
    shal is offline Intermediate Member
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    Default Status - Deferred. SMTP error 451

    Hi,

    I see some messages in log files like this. STATUS - DEFERRED

    May 24 09:32:36 corp postfix/smtp[25705]: 78F121BBCD04: host mx.tplants.com[85.234.0.132] said: 451-92.255.234.179 is not yet authorized to deliver mail from 451 <anna@rk-airplane.ru> to <project@tplants.com>. Please try later. (in reply to RCPT TO command)
    May 24 09:32:39 corp postfix/smtp[25705]: 78F121BBCD04: to=<project@tplants.com>, relay=mx2.tplants.com[85.234.0.68]:25, delay=9.3, delays=0.1/0.01/6.1/3.1, dsn=4.0.0, status=deferred (host mx2.tplants.com[85.234.0.68] said: 451-92.255.234.179 is not yet authorized to deliver mail from 451 <anna@rk-airplane.ru> to <project@tplants.com>. Please try later. (in reply to RCPT TO command))
    Is something wrong with configuration of my server?

    Here
    #2489 (address verification yields 451)
    I found that
    Server should accept mail with an Envelope-Sender of <> (the null address), used
    for processing bounce messages and an Envelope-Recipient of the sender of
    the message.


    Does it accept?

    What do I do with message 451 ? And why the message is DEFERRED?
    What means "not yet authorized" ?

    thanks in advance

  2. #2
    shal is offline Intermediate Member
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    Default SMTP error 4.7.1. Is there a problem with Zimbra sending server?

    I got a message deferred with error code 451 - 4.7.1.

    Here I found that this is always antivirus/antispam problem with sending server.
    http://www.answersthatwork.com/Downl...rror_Codes.pdf

    Here is a line from zimbra.log file
    May 25 15:21:12 corp postfix/smtp[13183]: 4C5661BBCE95: to=<zykova.o@krugcorp.ru>, relay=krug-sec.krugcorp.ru[212.24.60.132]:25, delay=4.9, delays=0.09/0.01/0.06/4.7, dsn=4.7.1, status=deferred (host krug-sec.krugcorp.ru[212.24.60.132] said: 451 4.7.1 Wait-wait, It'll be ok soon...Maybe ) (in reply to RCPT TO command))


    Is there a problem? What do I do with that?

  3. #3
    phoenix is online now Zimbra Consultant & Moderator
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    Default

    You haven't given any information about whether this has happened before with this server or it's the first time it's happened nor even if you've ever sent them any mail before.

    Quote Originally Posted by shal View Post
    Is there a problem? What do I do with that?
    The same answer would apply to both of your posts above, contact the mail administrator of those servers and ask them why they're rejecting your mail and/or see if you're on any sort of blacklist or RBL.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  4. #4
    shal is offline Intermediate Member
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    Default

    Quote Originally Posted by phoenix View Post
    You haven't given any information about whether this has happened before with this server or it's the first time it's happened nor even if you've ever sent them any mail before.

    The same answer would apply to both of your posts above, contact the mail administrator of those servers and ask them why they're rejecting your mail and/or see if you're on any sort of blacklist or RBL.
    I tried to contact them but no answer so far.

    Messages were deferred. They are dellivered but with some delay.

    Our server is working 5 days since 21-05-2012. The IP that we were given from our ISP
    was in
    1. blacklist 88.blacklist.zap,
    2. dynamic IP database MAPS - Stopping Spam at its Source DUL list
    Both blacklists delisted IP 2 days ago.
    IP is static. A,PTR,MX are OK. Open-relay test is OK. Users in our office can use mail via web interface only. 25 port for users is blocked by Zyxel Zywall USG50. The server is Ubuntu 10.04.4 LTS, Intel i3, 8Gb, RAID1. ~120000 emails ~80Gb of used space.

    The first two days we got some mail rejected/deferred because of lists above.

    Here is stats for 24-05-2012.
    743 received
    896 delivered
    0 forwarded
    4 deferred (12 deferrals)
    1 bounced
    8868 rejected (90%)
    0 reject warnings
    0 held
    0 discarded (0%)

    Here is stats for 23-05-2012.
    846 received
    1000 delivered
    0 forwarded
    4 deferred (9 deferrals)
    2 bounced
    7291 rejected (87%)
    0 reject warnings
    0 held
    0 discarded (0%)

    Bounced messages during the last two days were because of wrong recipient address.


    Maybe it is gonna take some more time after delisting?

    But the document about SMTP codes states that
    the problem is because of antivirus/antispam bug with sending server.

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