Email 403 error when sending

[dan223]

A few clients are getting a 403 error when sending an email, exim log shows:

2008-11-13 21:54:14 H=*********** (********) [**********] Warning: Sender rate 1.2 / 1h
2008-11-13 21:54:14 H=*********** (**********) [**********] sender verify fail for <marketing@********>: This email address does not accept incoming mail
2008-11-13 21:54:14 H=********** (******) [**********F=<marketing@**********> rejected RCPT <marketing@***********>: Sender verify failed
2008-11-13 21:54:14 unexpected disconnection while reading SMTP command from ********** (**********) [********]

* = Have been removed for forum use

[thewebhosting]

Is this happening for sending emails to all the email accounts or for any specific email address?

If for any specific email account then try after adding his/her email address in trusted senders.

[dan223]

It appeared there were forwarders setup to :fail: which caused this issue.