This page is designed to assist those users getting the following error message within their email:
550 This message was classified as SPAM and may not be delivered

Common solutions to the error

Solution #1 - Enable SMTP Authentication in Outlook

If you are using the Microsoft Outlook email client, not having SMTP Authentication will cause several points to be added to the spam score. This can cause emails that otherwise would be allowed through to be classified as spam. You can find instructions on enabling that setting that in our Invalid HELO name article.

Solution #2 - Evaluate email content

As our outgoing servers are using a spam evaluation software set at the most lenient levels, it is difficult for your emails to be tagged as spam and prevented from going out unless they have a lot of features of a spam message. If you are getting caught by the filter, evaluate both the title and body content of the message to ensure there are few, if any, references to popular spamming terms.

Solution #3 - Contact Live Support directly

If you have worked with the other solutions above and are still having issues with your emails getting classified as spam, you will want to contact our Live Support department. Simply forward the failed email complete with the bounceback headers to support@inmotionhosting.com and they will be able to test the email against the filter and find which rules were violated.

Why am I getting this error?

To help in the global battle of ever-increasing spam, we have implemented spam detection procedures on all emails prior to leaving our servers. Each email is evaluated and rated according to spam rules to determine how likely they are to be actual spam. Those that fail the test are returned to the original sender with the error message 550 This message was classified as SPAM and may not be delivered (please see the email below). If you are receiving a bounceback with this error, then the email you sent has not passed the outbound filter.

Why are you doing this on outbound emails?

Although email servers review all incoming email and evaluate it against their own filters, we have begun screening outbound emails to help preserve the reputation of our server's IP addresses. Once a mail IP gets enough spam complaints against it, it will be reported to a company that maintains a blacklist. Any email server that subscribes to that particular service will then block any incoming email from that IP address. After too many times on a blacklist, any email sent from our servers have the chance of automatically being delivered to spam folders, regardless of the IP address of the server. Also, since many of our customers are on shared servers, we feel it is not fair for your emails to be blocked due to the spamming activities of other customers. Outbound spam evaluation is a proactive measure to prevent blacklisting and keep your email server up and running.

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Comments

Post a comment
2013-12-01 10:14 am
So how do I prevent this? This error came as a result of someone registering as a user on my blog.
Staff
15,308 Points
2013-12-02 10:07 am
Hello 413webdesign,

This is not checked on a user basis, but each individual email is checked as it is sent out. This does not lead to a blacklist so if the message is corrected it will then be allowed to go through.

Kindest Regards,
Scott M
n/a Points
2014-04-16 5:05 pm

I am just trying to answer a personal email sent to me from a friend in Vermont. I have tried 4 times and all are labeled as spam. Why the problem?

n/a Points
2014-06-26 10:22 am

How does one correct this.  We have random legitmate emails classified as SPAM (some are even responses to recent incoming emials) Our domains are clear from all RBL according to mxtoolbox.com and your support personnel don't have an answer via chat.  They blame it on the way emails are sent, but don't have a clue to explain how they are supposed to be sent aside from outbound authentication that is already on the clinet.

Staff
7,372 Points
2014-06-26 10:27 am
The majority of times, it is caused by the mail client not appropriately authenticating as the user when sending mail. If you have ensured that your mail client is appropriately authenticating for sent mail, you may want to look deeper into the content of the message itself which may be flagged as spam.

For a more specific reason that your mail may be getting marked as spam, I recommend contacting technical support.

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