Smtp 550 message was not accepted

0 < #5. Smtp 550 message was not accepted. Roundcube. 1 this message is blocked due to security reason. Otrs 8.	Mail error. Ошибка при отправке на почту. Ошибка smtp outlook. Email unavailable. Ошибка 550.
228 smtp;550 5. 7. Roundcube интерфейс. Smtp 550 message was not accepted. Smtp 550 message was not accepted.	550 5. Сбой на email. Smtp 550 message was not accepted. Smtp 550 message was not accepted. Smtp 550 message was not accepted.
Reason - prohibited file types. Roundcube windows. Undeliverable message. Forwarded message from. 1 this message is blocked due to security reason.	Smtp 550 message was not accepted. 7. Delivery report. 0 < #5. Exchange 2003.
Remote server returned '554 5. Smtp 550 message was not accepted. Otrs 6. 228 smtp;550 5. 228 message is rejected.	7. Smtp 550 message was not accepted. Ошибка 550. 7. Smtp 550 message was not accepted.
Forwarded message. {"message":"","status":"fail"}. Smtp 550 message was not accepted. Smtp 550 message was not accepted. 228 message is rejected.	550 5. Remote server returned '554 5. Smtp 550 message was not accepted. Roundcube шаблоны. Отрс.
Smtp 550 message was not accepted. 00550 ошибка. Deliver перевод. Otrs 6 smtp 25. 7.	Reason - prohibited file types. Smtp 550 message was not accepted. Recipient address rejected: access denied. Ошибка при отправке письма. Smtp 550 message was not accepted.
Smtp 550 message was not accepted. Smtp 550 message was not accepted. 7. 7. Электронное письмо с ошибками.	Ошибка 550. Smtp 550 message was not accepted. 7. Smtp 550 message was not accepted. Smtp exchange.
Smtp exchange. Smtp exchange. Smtp 550 message was not accepted. Ошибка 550. Recipient address rejected: access denied.	Smtp 550 message was not accepted. 7. Otrs 6 smtp 25. Smtp 550 message was not accepted. Smtp 550 message was not accepted.
Smtp 550 message was not accepted. 228 message is rejected. Ошибка 550. Ошибка 550. Roundcube.	Smtp 550 message was not accepted. 0 < #5. 7. Roundcube шаблоны. 550 5.
Ошибка 550. Smtp 550 message was not accepted. Smtp 550 message was not accepted. 7. Smtp 550 message was not accepted.	7. Сбой на email. Smtp 550 message was not accepted. 7. Mail error.