Delivery has failed to these recipients or groups

If you are on our Exchange Hosting plans and have migrated from another provider, you may receive this error when sending an email to other users within your domain. You may get this “delivery has failed to these recipients or groups” error.

A sample error would be:

Delivery has failed to these recipients or groups

‘John Doe’
The e-mail address you entered couldn’t be found. Please check the recipient’s e-mail address and try to resend the message. If the problem continues, please contact your helpdesk.

Diagnostic information for administrators:
Generating server: server.Hosting.ca
IMCEAEX-_O=HOSTING_OU=EXCHANGE+20ADMINISTRATIVE+20GROUP+20+28FYDIBOHF23SPDLT+29_CN=RECIPIENTS_CN=johndoe+40domain+2Eca7d7@hosting.ca

550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found

This happens 100% of the time because special magic attributes inside cause this error because they don’t match us. To fix this, there are 2 ways depending on what you are using to send mail. The fix is to remove the affected email address from the autocomplete suggestion.

  1. If you send mail through OWA:
  • In webmail, click the New button to start composing a new email.
  • In the To: field, start typing an email address.
  • Click the “X” at the right on each address. or use the up and down arrows on your keyboard, select the email address you would like to remove from the suggested contacts list. Press the Delete key on your keyboard. Then continue typing in the address or you can select it from your address book.
owa remove autocomplete address

2. If you use Outlook 2010/2013/2016 to send mail:

  • Open Outlook.
  • Click the Mail tab on the bottom of the screen so you are viewing your mailbox.
  • Click New Email.
  • In the new e-mail window, start typing the address you want to remove in the To: field. When it appears, click the X button next to the address. Then continue typing in the address or you can select it from your address book.
Delivery has failed to these recipients or groups

This will fix the Delivery has failed to these recipients or groups problem when sending to other users in your domain.