postfix found user invalid

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#1 Sun, 02/07/2016 - 22:52

postfix found user invalid

Dear all friend,

I have this scenario as below: and I hosted in that server using (exim for sendemail by cpanel) and I hosted in that serve using(postfix for sendemail by virtumin)

my problem is or could not send email to each other and I got status as below:

This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: No Such User Here


50-No Such User Here 550 Sender verify failed (in reply to RCPT TO command)

in fact both users already created in both sides.

could you please give me idea about this issue?

Best Regards,