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MCEAEX '550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found' External Email

    Question

  • Greetings Everyone,

        When users try to send to two email addresses that are external they immediately get:

        IMCEAEX-_o=NT5_ou=00000000000000000000000000000000_cn=BC5E22A49F8C884095E915F3F5899A86@domain.com
        Remote Server returned '550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found'

        I have read the other similar questions but they pertain to internal mail and X500.

     
        All other email flows correctly to the same domain.

        Thank you.
    Tuesday, April 26, 2016 7:54 PM

Answers

  • Greetings Everyone,

        When users try to send to two email addresses that are external they immediately get:

        IMCEAEX-_o=NT5_ou=00000000000000000000000000000000_cn=BC5E22A49F8C884095E915F3F5899A86@domain.com
        Remote Server returned '550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found'

        I have read the other similar questions but they pertain to internal mail and X500.

     
        All other email flows correctly to the same domain.

        Thank you.
    Sounds to me like they don't have the correct email address entered.  It might be good to have them clear our their autocomplete cache and try again.

    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread

    Tuesday, April 26, 2016 8:39 PM

All replies

  • Greetings Everyone,

        When users try to send to two email addresses that are external they immediately get:

        IMCEAEX-_o=NT5_ou=00000000000000000000000000000000_cn=BC5E22A49F8C884095E915F3F5899A86@domain.com
        Remote Server returned '550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found'

        I have read the other similar questions but they pertain to internal mail and X500.

     
        All other email flows correctly to the same domain.

        Thank you.
    Sounds to me like they don't have the correct email address entered.  It might be good to have them clear our their autocomplete cache and try again.

    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread

    Tuesday, April 26, 2016 8:39 PM
  • Hi Stykx, 

    Welcome to our forum.

    Did this issue occur at recently or all the time?

    In addition Hinte’s suggestion, we suggest you create a new user and login with OWA, then type correct recipient email address to check if the issue persist.

    We also suggest you contact recipient’s domain to check if your domain name is in blacklist.

    Best Regard,

    Jim Xu

    Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact tnmff@microsoft.com.

    Jim Xu
    TechNet Community Support

    Wednesday, April 27, 2016 6:32 AM
    Moderator
  • I am having a similar error with a user in one of my clients.

    The point is that the user is duplicated in the Active directory, for this reason, just as precaution create a backup of the user's email in PST and remove the one with the oldest logon date, this date can be found using this script:  Get-AD-Active-Users Information and also work to mantain clean the AD.

    Friday, June 17, 2016 3:18 PM