What is SMTP Error From Remote Mail Server After End of Data: 550 High Probability of Spam
What does this error mean?
SMTP Error From Remote Mail Server After End of Data: 550 High Probability of Spam
Replies 3
Also the issue can be that InMotion servers are marked as SPAM points due to other users on the system and as such the people you are sending email to their servers see the IP address of the email and bounce it as probable SPAM. This is getting worse and worse for me and yes I've let InMotion know
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:
- 550 This Message Was Classified as SPAM and May Not Be Delivered
- 550 No Such User Here
- 550 Invalid address
Let us know if you have any further questions.
Thank you,
Ronnie
Also the issue can be that InMotion servers are marked as SPAM points due to other users on the system and as such the people you are sending email to their servers see the IP address of the email and bounce it as probable SPAM. This is getting worse and worse for me and yes I've let InMotion know
Hi Kevin, sorry to hear that you've been running into trouble with the IP address of shared accounts. We always work to rotate IP addresses if someone tied to it has been flagged as a spammer, so please continue to let us know if a particular IP address starts to cause you issues.