I don’t know what to do next in this case. A buyer just contacted me through my profile page 2 days ago and I already responded to him but, unfortunately, I’ve got an error message said that:
Delivery to the following recipient failed permanently: [buyer email] Technical details of permanent failure: The email account that you tried to reach does not exist. Please try double-checking the recipient's email address for typos or unnecessary spaces.
Just now he contacted me again and I tried to reply back but still no luck. I got the same error message that his email could not be reached.
I just posted my message on the comment section of the theme hoping he will see it.
Have you ever experieced the situation like this? Any suggestion?