If you are experiencing issues with emails bouncing back, please perform the steps below in the order listed.
Step 1: Check Blacklists
Blacklists are third party services that attempt to monitor servers around the world to determine which ones have spam-like characteristics. Some of them are quite sensitive and can designate a server as a source of spam simply by a high number of emails being sent from it in a given day.
To check if your server is listed on a Blacklist, go to MXToolbox.com, click Blacklists at the top and type in your server's IP address to check. If you don't know what your server's IP address is, login to your hosting control panel and expand the left-side module. The server IP will be listed in that left-side module.
If your server is listed on a blacklist, please skip down to step 3.
NOTE: Not all blacklisting services are listed here, but this is the most comprehensive list available on the internet to our knowledge.
Step 2: Check With Recipient
If your IP address is not listed on any Blacklists, you should then check with the recipient to make sure their email server is up and that they are not blocking you. If they don't have any settings in their email account that would be blocking you, they may need to contact their system administrator to find out if the server is blocking you.
Step 3: Contact Us
If your server is blacklisted or if you are unable to find the problem after going through both steps 1 and 2, please contact us by submitting a support ticket. You can find out how to do that by visiting the Support Center.
We, unfortunately, cannot troubleshoot the issue unless we can receive one of the bounced messages with the full header. You may either forward that to us through this email address that you're using or by logging into OnTheCloud.co and adding it to the ticket there. This will give us details about what generated it, whether it was our server or not. Our server does block IP addresses that have been marked as spammers, so if they have an issue on their server where it is sending spam, then our server will block them until they fix the issue.
