What is SMTP Error From Remote Mail Server After End of Data: 550 High Probability of Spam

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What does this error mean?

SMTP Error From Remote Mail Server After End of Data: 550 High Probability of Spam

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Ronnie H.
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Hello ahsanzia,

Thanks for getting in touch with us about receiving an SMTP error message. We'll explain what causes your 550 error and then go over how to fix it.

What Causes SMTP Error From Remote Mail Server After End of Data: 550 High Probability of Spam

The important part of this error is 550 High Probability of Spam. That error means the message is being blocked by the server's spam filtering system. If you're having trouble sending an email, make sure you are adhering to email best practices which we'll go over in the next section.

 

Some other unusual things that will cause messages to get marked as spam can include macros in an Excel spreadsheet, certain PDF files, and sending HTML emails without an equivalent plain text version.

How to Fix 550 High Probability of Spam

First, make sure you have your DNS setup correctly for sending emails for your domain. You can do this by setting up records for DKIM, SPF, and DMARC. This helps them verify that your email is being sent from a valid server, and has not been modified.

Next, you should consider avoiding common words that trigger spam filters

We also have the following guides for other common 550 errors:

Let us know if you have any further questions.

Thank you,

Ronnie