Diagnostic-Code: smtp; 553 sorry, that domain isn't in my list of allowed

Discussion in 'General' started by dynamind, Dec 17, 2013.

  1. dynamind

    dynamind Member


    a client told me he istn't able to succesfully send some emails, he get's the following error in detail:

    does it mean he's blocked on the receiver's side?

    best regards
  2. till

    till Super Moderator Staff Member ISPConfig Developer

    Yes, he is most likely blocked by the receiver.

Share This Page