Getting bounced back email content filter rejection

[associates]

Hi,

I was wondering if I can get some help here. I was sending someone an email but received a delivery status notification (failure) with the following message

The following message to <> was undeliverable.
The reason for the problem:
5.3.0 - Other mail system problem 554-'5.7.1 Message cannot be accepted, content filter rejection'

Does it mean I have composed something in my message which is being rejected by their mail server? I did not write anything fancy apart from some bullet points and some text in Outlook 2010.

I run hmailserver 5.3-B1617 with ASSP 1.8.1.4.

Any help would be greatly appreciated

Thank you

[Bill48105]

It means the remote server did not like something about your email but they are not specific beyond 'content' which likely eliminates your IP address, HELO & from address but not necessarily. In the end you'd only know if you asked them depending on who they are they may or may not cooperate & share that info.
Bill

[associates]

Thank you. I'll give them a call to find out why.