Forum Discussion

Pascal Wenders's avatar
Pascal Wenders
Brass Contributor
Nov 25, 2020

Remote Server returned '550 5.1.11 RESOLVER.ADR.ExRecipNotFound; Recipient not found by Exchange Leg

We have user that has in two different Hybrid exchange environments an account. Within Outlook there is configured for both the exchage enviroments an account. Exp. user@contoso.org and  user@exchange.org.  When the user sends a mail from user@exchange.org to a recipient in @contoso.org she gets a non deliverable message with the error Remote Server returned '550 5.1.11 RESOLVER.ADR.ExRecipNotFound; Recipient not found by Exchange Legacy encapsulated email address lookup . 

 

When she send the same mail from user@contoso.org to a recipient in @contoso.org there is not a problem.

 

It seems that the X500 adres wil be used, but the @exchange.org environment doesn't know the X500 adress from @contoso.org.

 

Does some one knows how we can disable the possibility that outlook uses the X500 addresses but only the smtp adress

  • Pascal Wenders ha ve you tried to empty the autocompletion list in Outlook or to disable the autocomplete list in outlook options ?

Resources