421 validating sender

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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][57058974] rsp: 250 OK [.99][57058974] Data transfer succeeded, writing mail to 97641527 [.99][57058974] cmd: QUIT [.99][57058974] rsp: 221 Service closing transmission channel [.99][57058974] 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.

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