Report email block from MailChannels

An email error from MailChannels indicates there’s a problem that’s preventing your email from being sent, typically because MailChannels, the system used to monitor and filter for spam, suspects your message might be spam.

To recognize an email error from MailChannels, you will typically receive an email in this format:

This message was created automatically by mail delivery software. 

A message that you sent could not be delivered to one or more of its recipients. 
This is a permanent error. The following address(es) failed: 

[your recipient's email address] 
host [] 
SMTP error from remote mail server after end of data: 
550 5.7.1 [CS] Message blocked. If this is a false positive, please report this to your hosting service provider. 

See [mailchannels URL here]

If you receive this message from MailChannels while sending out legitimate email that needs to reach your recipient, please open and submit a request to our team.