Не доходит на gmail - Your email has been blocked because the sender is unauthenticated

Не работает отправка с сайта на email с ошибкой в логах exim:

R=dnslookup T=remote_smtp H=gmail-smtp-in.l.google.com [108.177.15.26] X=TLS1.2:ECDHE-ECDSA-AES128-GCM-SHA256:128 CV=yes DN="/CN=mx.google.com": SMTP error from remote mail server after pipelined end of data: 550-5.7.26 Your email has been blocked because the sender is unauthenticated.\n550-5.7.26 Gmail requires all senders to authenticate with either SPF or DKIM.\n550-5.7.26\n550-5.7.26 Authentication results:\n550-5.7.26 DKIM = did not pass\n550-5.7.26 SPF [site.ru] with ip: [IPv4] = did not pass\n550-5.7.26\n550-5.7.26 For instructions on setting up authentication, go to\n550 5.7.26 https://support.google.com/mail/answer/81126#authentication ffacd0b85a97d-36b367d0394si4638518f8f.213 - gsmtp

Решение - прописать для домена:

- SPF/DKIM записи
- в поле From: от кого - нужно создать и указать реальный ящик на домене вида webmaster@ваш_домен

После этого отправка заработала.