Email being blocked by Recipient Mail Server

[Tim Coy]

We're having issues sending emails to clients using messagelabs. Our domain is pronvest.com and we're using office 365 for email. I also forwarded an email as attachment to [e-mail]. What's the best way for us to get this cleared up? The error message is below:

Reported error:	550 5.0.350 Remote server returned an error -> 553 Message filtered. Refer to the Troubleshooting page at;https://knowledge.broadcom.com/external/article?legacyId;=TECH246726 for more information. (#5.7.1)
DSN generated by:	MWHPR1101MB2350.namprd11.prod.outlook.com
Remote server:	server-28.tower-346.messagelabs.com

[Tim Coy]

This is now happening again!

[Sym_Y]

Hi Tim, 

Thanks for contacting us. I'm sorry you're having this issue.

Going forward if you see the error ' 553-Message filtered' , please submit the samples as outlined in this article below.

 Submit spam false positives when unable to use the Anti-Spam submission portal.

If you require feedback or want the analysis to be expedited, please have one of your partners who are our clients open a case with us and provide them the following info:

Details of the original email

•     Original sender and recipient addresses
•     Date/Time Sent
•     Subject of the email

Details of the false positive spam sample submission

•     "Sending" email address of submission
•     Date/Time Sent
•     Subject of the email

Regards,
Yamma

[Karim MIRAOUI]

Hello,

We have same problem 

For several days, we have encountered a blocking phenomenon on several of our customers despite a perfect configuration of our mail servers.

We use the Google business solution on all of our domains.

Example of a domain name with this message:

dkgroup.fr
bati-avenir.com
b2mconstruction.be
dkdigital.fr
dkprinting.fr

As well as all of our other domains, the most used being dkgroup.fr

Thanks for your help.