To decide if an email should be blocked/pre-blocked or not, Mailjet’s system examines several parameters including your sending history. The purpose is to anticipate deliverability problems and “block” an email from being sent when it has no chance of reaching the recipient’s inbox in order to avoid a negative impact on your sender reputation.
✓ A recipient reported your email as Spam
✓ The email address has already hard bounced in the past: Emails "Blocked" and "Pre-Blocked" by Mailjet
✓ An error in the Templating language. When using templating language features in Mailjet’s Email Editor, you may insert a syntax error. In this case the message will not be sent and will be marked as blocked in your statistics.
However, please note that this block is not permanent and if your next message to the same recipient doesn't contain syntax errors in the templating language, it will be sent.
For assistance with troubleshooting such errors, please visit the following article: Troubleshooting Your Test Emails
To check why an email was blocked, go to the Stats page and click on the subject line of a blocked email. The “details” column will show the reason of the block.
You might also notice the label "spam pre-blocked" in your statistics. Before your campaigns are sent, our system scans the campaign using an anti-spam software to check for any potential ‘spam’ related triggers or issues.
If your email was labeled “spam preblocked”, it means that the message would have been classified as Spam by the recipient server. For more details you can visit the link below:
Words That Will Trip The Spam Alarm
If you are certain that the address is active and the recipient would like to continue receiving your emails, after a spam report or a hard bounce occurred , you can open a ticket with our Support Team.