I am having problems with sending some emails. emails to gmail are not sent, then the sender receives the email saying it was delayed for 30 hours.
MailEnable: Message delivery has been delayed.
Message is waiting at xxx.net for delivery to gmail-smtp-in.l.google.com.
The message will be retried for another 30 hours.
Reason: ME-E0029: [5C5DCFB050BC40829837B596E7795305.MAI] DATA Command Failed. Transmit File: Communications Error Transmitting File to gmail.com.
what can be? I do not know whether it will be important but this happened after a spam attack ...