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Exchange 2003 outgoing e-mail problems since Thu 2nd August

  • 10-08-2012 11:51am
    #1
    melw
    Registered Users, Registered Users 2 Posts: 22 ✭


    On Thursday 2nd August all our outgoing e-mail suddenly got Undeliverable NDRs along the lines of:

    Your message did not reach some or all of the intended recipients.

    The following recipient(s) cannot be reached:

    *@*.* on 02/08/2012 15:51
    The e-mail address could not be found. Perhaps the recipient moved to a different e-mail organization, or there was a mistake in the address. Check the address and try again.
    <?.?.?.ie #5.1.0 smtp;550 5.1.0 <?@?.?.ie> sender rejected>

    Our Exchange 2003 server was configured to use smart host smtp.eircom.net which had been working fine for few years.

    Changed smart host to mail1.eircom.net, on the advice of Eircom tech, which made no difference.

    3rd party support company changed Exchange server to use DNS rather than smart host, which enabled most external e-mail to now work, except mail sent to *@eircom.net.

    Was advised by Eircom tech that there was no PTR record in place which was causing the problem (but it had never been a problem before this!). Eircom tech set up the PTR record for reverse.?.?.ie and advised that I request an A record be created with our MX hosts to match the PTR record.

    These have been setup and mail to @eircom.net addresses are still failing.

    Questions:
    As we already have an A record of mail.?.?.ie should the PTR record have been setup to match this, rather than reverse.?.?.ie?

    More importantly, what has been done by Eircom to cause this problem in the first place? Has something been put in place to stop e-mail from Exchange servers with missing or problematic PTR records being sent via or to Eircom?

    This is a serious problem which is affecting out business!

    Mel
    Tagged:


Comments

  • #2
    eircom: Mark
    Closed Accounts Posts: 3,441 ✭✭✭eircom: Mark


    melw wrote: »
    On Thursday 2nd August all our outgoing e-mail suddenly got Undeliverable NDRs along the lines of:

    Your message did not reach some or all of the intended recipients.

    The following recipient(s) cannot be reached:

    *@*.* on 02/08/2012 15:51
    The e-mail address could not be found. Perhaps the recipient moved to a different e-mail organization, or there was a mistake in the address. Check the address and try again.
    <?.?.?.ie #5.1.0 smtp;550 5.1.0 <?@?.?.ie> sender rejected>

    Our Exchange 2003 server was configured to use smart host smtp.eircom.net which had been working fine for few years.

    Changed smart host to mail1.eircom.net, on the advice of Eircom tech, which made no difference.

    3rd party support company changed Exchange server to use DNS rather than smart host, which enabled most external e-mail to now work, except mail sent to *@eircom.net.

    Was advised by Eircom tech that there was no PTR record in place which was causing the problem (but it had never been a problem before this!). Eircom tech set up the PTR record for reverse.?.?.ie and advised that I request an A record be created with our MX hosts to match the PTR record.

    These have been setup and mail to @eircom.net addresses are still failing.

    Questions:
    As we already have an A record of mail.?.?.ie should the PTR record have been setup to match this, rather than reverse.?.?.ie?

    More importantly, what has been done by Eircom to cause this problem in the first place? Has something been put in place to stop e-mail from Exchange servers with missing or problematic PTR records being sent via or to Eircom?

    This is a serious problem which is affecting out business!

    Mel


    Hi melw,

    Can you PM me with the e-mail address in question and your landline telephone number please.

    Thanks, Mark


  • #3
    melw
    Registered Users, Registered Users 2 Posts: 22 ✭melw


    Hi Mark,

    PM sent.

    Since starting the thread I have heard back from Eircom tech that

    "Changes have been made to the eircom SMTP servers to combat the growing problem of spam on our network. One of the new rules is that the sender domain must have an MX record on the top level domain. Operations have said that this is the reason for the current issues that you are having."

    Mel


  • #4
    melw
    Registered Users, Registered Users 2 Posts: 22 ✭melw


    The additional MX record for the TLD has been added and everything is working fine now.

    Why did it take 8 days for Eircom to admit that changes were made to their system which caused the problem, and to advise what needed to be done to resolve it?

    Why were customers not advised in advance of these changes to be prepared so there would not be any downtime?


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