InMotion Hosting Support Center

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 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.

Continued Education in Course 201: Dealing with Spam
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Section 5: SPF Records and Domain Keys: Combating Spam

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Related Questions

Here are a few questions related to this article that our customers have asked:
550 spam message when using PHPMailer
Email sent by friend rejected as spam
Spam pass through not working
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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.
29,148 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 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.

11,186 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.
n/a Points
2014-08-08 1:30 am

This is very frustrating and it is hindering my ability to conduct my business. I have tried several times to correspond with my accountant only to have my messages marked as spam. I should not have to fine tune the content of my message. Your company needs to fine tune its content filters or I may have to find another hosting company!

29,148 Points
2014-08-08 8:18 am
Hello Murray,

I am sorry if you are having problems with your email making it through the outbound spam filter. It is very rare that customers have this problem if they are not sending out anything that can be classified as spam. Sometimes customers have a business that deals legitimately in products that others create a lot of spam about, or if they overemphasize money or other spam-related content.

This is in place so that the entirety of the server mailing IP does not get flagged as spam and then everyone's messages bounced back due to no fault of their own.

If you wish to get past the filter, you will want to check the content. You can even have our Live Support team check to see what specifically is being flagged so you can avoid that. If you belong to one of those groups that are being flagged constantly for legitimate reasons you can request to be whitelisted.

Kindest Regards,
Scott M
n/a Points
2014-08-14 1:00 pm
I am getting this notification anytime I try to email a new person or even when replying to an existing person. It happens daily, prevents me from doing business. These are not spam messages. I am responding with one line to an email that came in to me where business is being discussed
29,148 Points
2014-08-27 10:45 am
Hello Stefan,

Our filter is catching the emails for a reason, however there are times when the reason is still relevant to a legitimate email. As this issue will be specific to your account and email you will need to contact our Live Support in order to have them take a look at it for you.

Kindest Regards,
Scott M
n/a Points
2014-09-01 3:59 pm

I contacted the support 3 times ans my problem with spam hasn't solved.

I need to send very emails in my business. my e-mail every time is marked as Spam ... You don have a Whitelist ? This is very frustrating .. my e-mails is not a SPAM !!!

11,186 Points
2014-09-02 2:01 pm
I'll be happy to take a look for you. Unfortunately, I was unable to locate an account under the email address that you left this comment with. If you could provide us with the primary domain on your account, I'll be happy to take a look.
n/a Points
2014-10-01 2:12 pm

Currently having a similar problem. Never existed before. Just started happening this week. My primary domain account is http://******.com.Please solve this. It is very frustrating.

17,726 Points
2014-10-01 2:26 pm
Hello Henry,

Thank you for contacting us. We are happy to guide you, but will need some additional information. Did you try any of the solutions above?

This is just our public forum. If you want assistance reviewing your specific account, please contact Live Support. This allows them to review email logs, and also assist you in real-time, while you are sending the emails.

If you have any further questions, feel free to post them below.

Thank you,
n/a Points
2014-10-01 2:34 pm

Thanks for the prompt respponse. I called technical support and the problem has been resolved. Thank you for the fast response guys. Much appreciated. Have a good day.

n/a Points
2014-10-14 5:45 am
Rework your outgoing spam filter. When i reply for an incoming email that must not be classified as spam. I replied from my android phone to a mail from China and i got blocked by your system. Things go into a wrong directuon giys. A certain domain needs to get blocked not a whole mail server if it is not a spam server
29,148 Points
2014-10-14 8:06 am
Hello Steve,

Each individual message is checked when outgoing. If you are getting a 550, that means the content of that particular message failed the spam filter. Above is a list of things to check before that email can be sent successfully.

Kindest Regards,
Scott M
n/a Points
2014-10-14 8:26 am

This is the email I sent from my Sony Android phone and your system blocked it. I pay for your service for my business and I cannot use the term "price" in my emails??? It is not okay as it is. Will move next year if no change and I get error messages when emailing. I never ever sent out any spam or never conducted any DM email campaign and I get blocked when I reply to an incoming email? Check your filtering system, it is far not smart as it is. "From: Steve Istvan Novak @ xxxxxx [] 

Sent: Tuesday, October 14, 2014 12:17 PM To: Lily Subject: Re[4]: RE: Syringe--Dental


Tell me the price and we will see!


-- Sent from myMail app for Android"


11,186 Points
2014-10-14 9:03 am
It is quite common for spam to use both the words "syringe", "dental", and "price" all within a very short email which is why this is being flagged. If you contact technical support, they will be able to disable the rules for you so that the mail will no longer be filtered.
n/a Points
2014-10-28 5:12 pm

You're blocking me from sending email to my business partner and friends. This is the content of the latest one "Hi Esta, my email is acting weird, so I'm just trying to send you a message to see if it will work. C"


You're making me hate you right now.


11,186 Points
2014-10-28 5:17 pm
This can be caused by multiple things. Do you have an email signature? What is the subject of the email? Are you fully authenticating within your email client to successfully log in with the email address and password for the account that you are sending from?
n/a Points
2015-02-11 2:29 am

You guy's are in LALA Land!

I have never heard of anything so ridiculous, we can't reply to our best customers and there are no attachments and nothing about our replies are SPAM.

I suggest you fix this problem otherwise we will be changing our hosting. We don't need more questions or any suggestions just fix it please!

Thats All

International Sales and Marketing Manager

Bell Marine

26,137 Points
2015-02-11 9:25 am
Hello Steve,

Sorry that you're having problem with this ssue. As over 80% of emails on the internet are classified as spam, regulation on outgoing emails has become stricter. You can refer to the Can SPAM Compliance guide for Business if you want an official reference on this issue. One of the main reasons for these guidelines is to prevent the emails servers from being blacklisted due to outgoing customer emails. It is also possible to host your emails with a different service. If you have any further questions or comments, please let us know.

Arnel C.
n/a Points
2015-02-12 6:15 pm
This page is suggested in the error message. I do not use Outlook, and could not send you the "offending email" because I each time I attempted to do so (seven times, each time changing the subject line, or trying to tweak my content without changing the content of the one that originally bounced), I continue to receive the same error message:

"""An error occurred while sending mail. The mail server responded: This message was classified as SPAM and may not be delivered. For more information, please see Please check the message and try again."""

I would like a little assistance, please.... I have been a customer of yours for several years.
29,148 Points
2015-02-16 11:58 am
Hello Daniel,

The outbound spam filter evaluates the content of the email and gives it a rating. If the rating is above a certain number it is not allowed to go out as the email is seen as being spammy.

The Outlook suggestion is obviously only for those using that client, so it would not apply to you. However, have you evaluated the content against the list of spam words that are linked in the third suggestion? That is often where the issue lies.

Kindest Regards,
Scott M
2015-02-14 9:49 am
ok, this is driving me nuts. I've paid for McAfee Email Protection through InMotion, but I was still getting spam. I switched to using Outlook 2013 so that I could use the McAfee "button" that lets me send spam (that has passed into my inbox) back to McAfee. However, APache SPam Assassin (or whatever you're using to block outgoing spam) is blocking it. Can you PLEASE set up your system to not give 550 errors when we're trying to send spam to a place that says, "Send your spam to this address"? You're kind of defeating the purpose here. This is VERY frustrating.
n/a Points
2015-02-14 2:24 pm

It's obvious why my outgoing mail was marked as spam; it IS spam.

I'm trying to forward it to the FTC to report the spammer. 

Seems like could be whitelisted? 

29,148 Points
2015-02-16 11:48 am
Hello Sarah,

The outbound filter only goes by the content in the email body, not the address to which it is sent. This means there is not a way to whitelist that address as that is not how the filter works. You may want to send it from another email account by copying and pasting it as an email and then sending it. You can also make the email content into a file and send the file itself, though I am not sure how they receive things like that.

Kindest Regards,
Scott M
n/a Points
2015-03-16 8:47 am

i having problem with my recipient issue that when in send mail to above email ID the recipient does't recieve.

Please help urgent because my buisness is colapsing

26,137 Points
2015-03-16 11:56 am
Hello Wilberforce Somiah,

I'm sorry to hear you're having problems with sending email. Unfortunately, we have no details on the issue. Can you please provide at least the error message, email address, and any bounce-back messages to help troubleshoot the problem? Please provide us some information and we would be happy to help.

Arnel C.
n/a Points
2015-08-26 4:50 pm

Are you people completely ******* crazy!?!?!?!??!

Have you ever heard of a thing called a law-suit???

I read this on one of your pages: "... 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."

Umm, so why are you blocking our outbound emails to our friends???

Pre-emptive strike mentality???

Your customers don't pay you to block their emails!!


Your captchas are v annoying too!!!!!!!!!!!!!!!!!!!!



26,137 Points
2015-08-26 5:12 pm

Apologies that you are very angry at the software for accusing you of spamming. If you can provide details on the email involved and the bounce-back that has "accused" you of spamming, we can check to see what's happening. Spam can be the result of many different things - it could be malware on your site or even the result of a mass email that was not simply formatted a particular way. Please see Stop Emails from Being Labeled as Spam.

There have been stricter rules placed on outgoing email in order to reduce servers from being black-listed as spam servers. If your emails have been mistakenly identified as spam, then please provide us information on the emails and your account in question and we can investigate the issue detail.

You're also welcome to contact our live technical support team via phone/chat/email - they are available 24 hours a day / 7 days a week.

Please provide us a little more information and we can identify what's happening with your emails.

Arnel C.
n/a Points
2015-08-26 5:46 pm

Your reply is as fatuous as it is useless.

Now you want to read my private email?

"... we can identify what's happening with your emails."

I already know what's happening with some of my emails - your stupid filter system is blocking them and accusing me of spamming!!

How the Hell do you turn round and tell us that our emails are at fault!?!?!?!?


26,137 Points
2015-08-26 5:49 pm

If you refuse to work with us, when we're simply trying to help, then I do apologize that we can't provide you assistance. Long angry replies do not help anyone. If you wish to work with us, then please provide some information, or contact our support team who can provide immediate assistance.

Kindest regards,
Arnel C.

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