451 4.5.3 Too many rejections; try again later.
My friend was trying to email me today and it got bounced back to him. I am wondering how many other emails I've missed... This is the message he got (I DELETED our addresses obvi):
From: Mail Delivery Subsystem<mailer-daemon@googlemail.com>
Date: Tue, Feb 3, 2015 at 5:36 PM
Subject: Delivery Status Notification (Delay)
To: DELETED
This is an automatically generated Delivery Status Notification
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipient has been delayed:
DELETED
Message will be retried for 2 more day(s)
Technical details of temporary failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain me.com by mx1.mail.icloud.com. [17.158.8.67].
The error that the other server returned was:
451 4.5.3 Too many rejections; try again later.