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Enterprise Software Thread, Exchange 2010 Distribution groups - NDR with 550. 5.7.1 error in Technical; Hi; Wonder if anyone can help. users have reported today that when parents sends something to our distribution group they ...
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    Exchange 2010 Distribution groups - NDR with 550. 5.7.1 error

    Hi;

    Wonder if anyone can help.
    users have reported today that when parents sends something to our distribution group they get an 550.5.7.1 unable to deliver message

    sending to individual mailbox from yahoo or gmail ok.

    sample of the NDR:

    Sorry, we were unable to deliver your message to the following address.

    <finance@school.surrey.sch.uk>:
    Remote host said: 550 5.7.1 Unable to deliver to <finance@school.surrey.sch.uk> [RCPT_TO]

    --- Below this line is a copy of the message.

    Received: from [212.82.105.245] by nm15.bullet.mail.ird.yahoo.com with NNFMP; 09 Nov 2012 14:15:15 -0000
    Received: from [212.82.108.135] by tm17.bullet.mail.ird.yahoo.com with NNFMP; 09 Nov 2012 14:15:15 -0000
    Received: from [127.0.0.1] by omp1040.mail.ird.yahoo.com with NNFMP; 09 Nov 2012 14:15:15 -0000
    X-Yahoo-Newman-Property: ymail-3
    X-Yahoo-Newman-Id: 71868.40783.bm@omp1040.mail.ird.yahoo.com
    Received: (qmail 5349 invoked by uid 60001); 9 Nov 2012 14:15:14 -0000
    DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.co.uk; s=s1024; t=1352470514; bh=A/tMG38nsn2UERqV1t2dlxp68jpk8QAHG+D8IuXzQz0=; h=X-YMail-OSG:Received:X-Mailer:Message-IDate:From:Reply-To:Subject:To:MIME-Version:Content-Type; b=TQmXJfEfhriJGRNH2zpsx+xfn6kuc5NZgz/qnsBmidB3uBJD6H9pyvLJwtiVyvwdMymiLN+Wz9Flb+LUKGTF+ raLK3uES0SNHdFZTc7gpcLA5z4Y8FQc6K3K+GKhrcFDVnojNBA rDG1QFzi2edTVViPxXcafQaLlMKsNs5Wm5X8=
    DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws;
    s=s1024; d=yahoo.co.uk;
    h=X-YMail-OSG:Received:X-Mailer:Message-IDate:From:Reply-To:Subject:To:MIME-Version:Content-Type;
    b=lr7KRrbAUmcOXzG3mfTaWHXByNtQHbkh2mimWnVJ0zTmeztZ h2TQaDqWDQ0VTSey3bv9atdGAsBDcEU59Ywl78eMSJcjDRv+S4 53J/QB8zkBvW3Y0Bqr9GZIf3G/mm0DFPb9d2KZ/g/25XuGk/JGP7BTJSLxDnu1ODr3oR0D09c=;
    X-YMail-OSG: QIRWABYVM1lLkSnHMIjUmNM3TL4IAyPImfbrlRNN026q4B_
    GB5WTfP8tSLGceNSfl1ycU1N5n0SXwnbXkdHLAkcjhyfXATxph tTiu9QzRzd
    gGU3uy6MnRsjA7aEFIsD23pTRGZr.u5BF7LTUCFHWlhlK0faVo KJnwyCmZDD
    pfbUZH_._svlSQIY.i9YaxEhfBrH3WoLzvvl94rxrvGAk9QBn9 ipjoaJqCGP
    JZegP8TM.fUKo7m.AI0eblw7Ahq9z3pt6n8D06dccTibB1Mb.J PFMzjDinUt
    1JnfMdnk59yJQszW9Yk.MZsXfrjRrGUmKS5HF1Okd6ZX7nbn5R IF8mpO2Ne2
    K2kWA61DVFtOtVokU.3e9.CjSSwO5VfBS8u4KMza9YebPHqUQi dQkzb6ubPY
    ukqyPMMOb0EEPrsuoHP8O56UHZaoC2yPz5NpBhCZUCPzr1aNid rthaeaid8d
    .6sg_FbBk80byKcW.M_Jrp8DTp_3wy.8qAGCbPoNWxmlNjQyPV w--
    Received: from [87.248.115.56] by web172404.mail.ir2.yahoo.com via HTTP; Fri, 09 Nov 2012 14:15:14 GMT
    X-Mailer: YahooMailWebService/0.8.123.460
    Message-ID: <1352470514.1971.YahooMailNeo@web172404.mail.ir2.y ahoo.com>
    Date: Fri, 9 Nov 2012 14:15:14 +0000 (GMT)
    From: user <user@yahoo.co.uk>
    Reply-To: user <user@yahoo.co.uk>
    Subject: test test
    To: "finance@school.surrey.sch.uk" <finance@school.surrey.sch.uk>
    MIME-Version: 1.0
    Content-Type: multipart/alternative; boundary="398296598-480247934-1352470514=:1971"

    --398296598-480247934-1352470514=:1971
    Content-Type: text/plain; charset=us-ascii

    --398296598-480247934-1352470514=:1971
    Content-Type: text/html; charset=utf-8
    Content-Transfer-Encoding: quoted-printable

    <html><body><div style=3D"color:#000; background-color:#fff; font-family:ar=
    ial, helvetica, sans-serif;font-size:12pt"><div></div></div></body></html>
    --398296598-480247934-1352470514=:1971--


    We use our ISP's smarthost to Spam check and forward our emails to my Exchange serevr, first people I approached and they blamed it on my Exchange.

    I have also delibrately sent a mispelt email and the same sort of NDR gets returned.

    I suspect some of the addresses are not updated on my ISP smarthost flter and emails not getting through as a result

    My Exchange 2010 allows distribution groups to recieve emails externally without the need for authentication


    I also nicked one of the distribution external email address and applied it to my mailbox, test externally and I get a similar NDR.

    Any ideas? Could it possibly be my end in this case?

    Thanks as always.

    PS I have over October half term changed reply email address globally since we gone academy, but not sure whether that makes a difference
    Last edited by MrWu; 9th November 2012 at 02:39 PM.

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    Have you configured the groups to only allow delivery from certain groups to prevent students from sending mail to these staff groups?

  3. Thanks to ChrisMiles from:

    MrWu (9th November 2012)

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    Quote Originally Posted by ChrisMiles View Post
    Have you configured the groups to only allow delivery from certain groups to prevent students from sending mail to these staff groups?
    Hi Chris;

    The students are on a seperate Frog email system so they cannot send emails externally and only to teachers in the frog domain

    I'm getting my ISP to check thier email forwarding, I do have a suspicion something is mucked up with thier address book in the SPAM filter

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    You say you changed reply address globally in half-term - does this mean your mail domain name's changed? If this is the case you'll have to change (or add) the Authoritative domain address in Organisation Config -> Hub Transport -> Accepted Domains, otherwise your Exchange will assume it's being asked to relay and give you a 550 5.7.1 error.

  6. Thanks to timzim from:

    MrWu (9th November 2012)

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    In exchange go to the distribution group - go to mail flow settings -message delivery restriction and untick all users need to be authenticated. this is enabled by default on exchange 2010 and essentially means internal only (unless the external manages to auth against your server).

  8. Thanks to glennda from:

    MrWu (9th November 2012)

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    Quote Originally Posted by timzim View Post
    You say you changed reply address globally in half-term - does this mean your mail domain name's changed? If this is the case you'll have to change (or add) the Authoritative domain address in Organisation Config -> Hub Transport -> Accepted Domains, otherwise your Exchange will assume it's being asked to relay and give you a 550 5.7.1 error.
    Cheers timzim;

    I added the authoritive domain back in august and tested with my new email domain, which has been working for a few months. over Oct I migrated the rest of the users and groups to the new email domain reply address.

    All working until today (send to individual mailbox from yahoo - ok....send to distribution group from yahoo - NDR)...wierd

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    Quote Originally Posted by glennda View Post
    In exchange go to the distribution group - go to mail flow settings -message delivery restriction and untick all users need to be authenticated. this is enabled by default on exchange 2010 and essentially means internal only (unless the external manages to auth against your server).
    cheers glennda;

    Yes they are all unticked in Exchange 2010...it is possible that my external ISP has screwed up LDAP import and those distribution groups have disappeared off thier SPAM filter...


    interestingly, the external email address that belonged to one of the distribution group, now works when applied to my mailbox...

    ie finance@school.surrey.sch.uk > MrWu@school.surrey.sch.uk ...now works when an email is sent to finance@school.surrey.sch.uk (no NDR and email arrives at my inbox)

    finance@school.surrey.sch.uk > finance distribution group ... NDR 550.5.7.1

    anywhere I could take a further test?

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    glennda's Avatar
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    do they look to specific ou? distribution group in a different one?

  12. Thanks to glennda from:

    MrWu (9th November 2012)

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    Sounds like it's your ISP then - I have a vague memory of a similar thing happening here and turned out their mail relay DNS was hooky.

  14. Thanks to timzim from:

    MrWu (9th November 2012)

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    Quote Originally Posted by glennda View Post
    do they look to specific ou? distribution group in a different one?
    My ISP is as useful as a chocolate heatsink and as far as they tell me they pull a automatic LDAP enquiry based on a list of users pulled from admin and teacher staff OU...at one point a chunk of it went missing a few weeks ago, meaning load of emails that staff and parents sent in from externally went missing or NDR, they blamed us on the change of OU we did in Summer! Like how often does the LDAP update?

    In saying that though, if I took the external email addresss from a non working distribution group (in this case finance@school.surrey.sch.uk and applied that to SMTP for my inbox MrWU@school.surrey.sch.uk and it started working(ie I send finance@school.surrey.sch.uk via yahoo it goes through to Exchange into MrWu mailbox, does it still point to my Exchange Server being at fault? Since the SPAM filtered passed that through ok? Woud the SPAM filter know distribution group mapped to what external email address?

    However, It does take 15-20 minutes for the above tweak for my little test to work, making me think the SPAM filter is doing something inbetween.

    Also using the new finance@school.co.uk external email NDR as well when applied to distribution group.

    Very puzziling...
    Last edited by MrWu; 9th November 2012 at 08:30 PM.

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    The NDR you have posted doesn't contain the full status code, the issue to me seems to be with your ISP and their sync process. They may be only syncing certain objects/objectclasses i.e User and not DL. Or something may have changed which does not sync all that is expected.

    As for moving the non-working DL SMTP to your account, which then seems to work, says what I suspect above.

  17. Thanks to sukh from:

    MrWu (12th November 2012)

  18. #12

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    Quote Originally Posted by sukh View Post
    The NDR you have posted doesn't contain the full status code, the issue to me seems to be with your ISP and their sync process. They may be only syncing certain objects/objectclasses i.e User and not DL. Or something may have changed which does not sync all that is expected.

    As for moving the non-working DL SMTP to your account, which then seems to work, says what I suspect above.
    Thanks sukh

    I have monitored port 25 with Microsoft Network monitor...when I send to Distribution List from external I definitely get nothing hitting the Exchange Server on Port 25 (I see traffic going through if I send to an individual mailbox)..so quite sure it's an ISP issue

    Just be a long struggle getting my damn ISP to sort it....they send me a test email and says everything is ok...I keep telling them it's the Distribution Lists lol !

    Wil

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