MailChannels has blocked my message as SPAM


Written by Dennis Nind

Last published at: June 26th, 2019

MailChannels is a facility which we have in place to prevent abuse of our email service and to ensure accurate delivery of your emails without being affected by IP blacklists.

However, for MailChannels to efficiently prevent blacklisting of their own IP addresses / infrastructure, they also provide outbound SPAM filtering, which is included free of charge with each and every account.

I received a bounce message, but I am not sending SPAM!

First of all, read the entire bounce message - we understand entirely that these messages may seem daunting, but they usually provide sufficient information to diagnose 'why' a message has bounced.

For example...

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:
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

If you are sending a message which is being flagged as SPAM, but you are confident is genuine, then you can report this as a 'false positive' to MailChannels. 

How do I get my email to send?

As you can see from the above, we have highlighted something key here - 

SMTP error 550 - Message blocked

This means that MailChannels have blocked the message from being delivered. Why? Well, thats easy to find out!

In that same bounce message, you will also see a link...

This link is a self-service link, which allows you to report a 'false positive' to MailChannels so that they can let the email through.

When you click the link, you will see something similar to the following...

From here, click 'Not SPAM' to 'report' this to MailChannels directly. They will then review the message and check the accuracy of your report allowing you to then send the message again. 

This process can take around 30 - 60 minutes.

If after that duration of time you are still unable to send, please contact our support team on with the full contents of the bounce header, as well as the following key bits of information...

- Sender Email Address
- Recipient Email Address
- Time / Date of the Original Message Attempt

From here, we will then report this to MailChannels directly for their review.