SymptomsEmails cannot be sent through AtMail. When click Send Mail popup window is created with the following message:
Could not send message to SMTP server. Check that you have access to send messages via the server and that all To/CC/BCC addresses are valid\nError: SMTP Server rejected mail. Returned:553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)
What may cause the problem?