Do not leave letters from one mailbox (Postfix, Dovecot, Postgrey)?

Question

linux

Hi all!
In general, such a situation, outgoing ones do not leave one box.
On external servers the following error:

Ошибка отправления почты. Почтовый сервер ответил: 
5.7.1 <[email protected]>: Relay access denied.
Проверьте правильность написания адреса получателя «[email protected]» и попробуйте снова.

When sending to domestic:

4.2.0 Recipient address rejected: Greylisted, see http://postgrey.schweikert.ch/help/мойдомен.com.html

Answer 1

Most likely you have not set up SMTP authorization, write the username and password for the SMTP server in the mail application.