Gmail: ошибка 550 5.7.1, письмо оформлено не по RFC 5322

Обновлено 29 октября 2026

В этой статье
  1. Что это значит
  2. Что делает Estismail
  3. Другие ошибки Gmail

Точный текст ошибки

550 5.7.1 Messages missing a valid address in the From: header, or having no From: header, are not accepted. For more information, go to Email sender guidelines and review RFC 5322 specifications.
550 5.7.1 Messages missing a valid Message-ID: header are not accepted. For more information, go to Email sender guidelines and review RFC 5322 specifications.
550 5.7.1 Messages with multiple addresses in the From: header are not accepted. For more information, go to Email sender guidelines and review RFC 5322 specifications.
550 5.7.1 The message contains a unicode character in a disallowed header. To review our message and header content guidelines, go to File types blocked in Gmail.
550 5.7.1 This message is not RFC 5322 compliant because it has duplicate headers. To reduce the amount of spam sent to Gmail, this message has been blocked. For more information, go to Email sender guidelines and review RFC 5322 specifications.
550 5.7.1 This message is not RFC 5322 compliant because the From: header is missing. To reduce the amount of spam sent to Gmail, this message has been blocked. For more information, go to Email sender guidelines and review RFC 5322 specifications.
550 5.7.1 This message is not RFC 5322 compliant because it has multiple From: headers. To reduce the amount of spam sent to Gmail, this message has been blocked. For more information, go to Email sender guidelines and review RFC 5322 specifications.
550 5.7.1 This message is not RFC 5322 compliant because the From: header has a non-compliant domain name. To reduce the amount of spam sent to Gmail, this message has been blocked. For more information, go to Email sender guidelines and review RFC 5322 specifications.
550 5.7.1 Encoded-word syntax is not permitted in message header header-name. To reduce the amount of spam sent to Gmail, this message has been blocked. For more information, go to Email sender guidelines and review RFC 5322 specifications.
550 5.7.1 This message is not RFC 5322 compliant. There are multiple header-name headers. To reduce the amount of spam sent to Gmail, this message has been blocked. For more information, go to Email sender guidelines and review RFC 5322 specifications.
550 5.7.1 This message is not RFC 5322 compliant. There is a malformed header- name header. To reduce the amount of spam sent to Gmail, this message has been blocked. For more information, go to Email sender guidelines and review RFC 5322 specifications.

Тип ошибки: Стандарт RFC

Что это значит

Письмо оформлено не по RFC 5322: нет или неверен заголовок From, нет Message-ID, повторяются заголовки, недопустимые символы или кодировка в заголовке. Такое письмо не примут ни одному получателю Gmail.

Что делает Estismail

При таких отказах Estismail ставит отправку рассылки на Gmail на паузу и повторяет позже; если отказы продолжаются, останавливает её окончательно. Адрес подписчика не блокируется. В отчёте: «Gmail заблокировал письма как СПАМ».

Другие ошибки Gmail