421 validating sender
Could not deliver message to the following recipient(s): Failed Recipient: [email protected]: Remote host said: 421 4.7.0 Senders Guidelines.
Greylisting requires that the server retries the connection, between 1 minute and 12 hours. The connection is temporarily failed while updated reputation information is obtained. This can be caused by files that have previously been infected with a virus, and have not been cleaned correctly by an anti-virus product, which has then left traces in the email.
with SMTP; Wed, 0000 MIME-Version: 1.0 From: [email protected]: =?
[.99] rsp: 250 OK [.99] Data transfer succeeded, writing mail to 97641527 [.99] cmd: QUIT [.99] rsp: 221 Service closing transmission channel [.99] disconnected at 1/4/2016 AM the official google page here https://support.google.com/a/answer/3726730? but none match what i am getting "Senders Guidelines" what can i do about this? Here, the tech guy from Host Gator can investigate the actual account who sends the mail.
This error typically indicates a client defect or a hacking attempt.
This error message is issued if the domain address given in the EHLO command does not have the correct syntax.