Question SMTP Error (550)

[Mustafa Asker]

Everyone can send mail and I can receive any mail. the subscriptions I host on the same server can not send mail to each other. I'm getting the error below.

SMTP Problem (550): "[email protected]" recipient could not be added (5.1.1 <[email protected]>: Recipient address rejected: User unknown in virtual mailbox table)

 

[Mustafa Asker]

My hosted domains (exrom.net, exrom.com.tr)

[email protected] -> send to all e-mail addresses successfully .. [email protected] does not send mail to users. I get this error when I press the send key.

SMTP Problem (550): "[email protected]" recipient could not be added (5.1.1 <[email protected]>: Recipient address rejected: User unknown in virtual mailbox table)