Ситуация: кодер по ошибке запустил рассылку на не очень большое кол-во адресов (наши клиенты), но очень большое кол-во раз. В итоге Google отказывается принимать почту с нашего домена. При попытке отправки пишет:
This is the mail system at host domain.ru.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
<adress@gmail.com>: host gmail-smtp-in.l.google.com[64.233.164.27]
said: 550-5.7.1 [x.x.x.x 12] Our system has detected that this
message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam
sent to Gmail, 550-5.7.1 this message has been blocked. Please visit
550-5.7.1 https://support.google.com/mail/?p=UnsolicitedMessageError 550
5.7.1 for more information. s19si15570516lji.163 - gsmtp (in reply to end
of DATA command)