Hosting Blog

Emails bouncing back with error (Sorry, I couldn't find any host named domain.tld?.)

Sometimes we've seen that when we send emails using Outlook and other email programs, they get bounced back with the error message below:-

---------------------------------------------------------------------------------------

<[email protected]>:
Sorry, I couldn't find any host named domain.tld?. (#5.1.2)

---------------------------------------------------------------------------------------

But emails are getting delivered fine using webmail (Horde, SquirrelMail, etc).

The reason for this is that Outlook and other email programs sometimes add characters (spaces) at the end for the email address. You are not able to see them or you don’t recognize them.

qmail is very sensitive about things which are not completely correct and it rejects the email.

Solution for fixing this error in Microsoft Outlook:-

For Microsoft Outlook, the solution is to export the address book into Excel. Open the .xls file and check if the opening of the file has removed the spaces at the end of the email addresses. You will see that qmail will act normally after this. (IMPORTANT) You have to save the file to overwrite the original.

That's it. Now emails will get delivered properly after fixing the address book in Outlook.