Separate names with a comma.
The error message tells me to contact an administer. That was what I was trying to do!
I've had the same thing in PMs. It seems like a lot of words can trigger the spam filter. E.g. names of religions, of companies, anything that could be related to solicitation. Even the word "banned" for some reason. For example it could help to change the word "Amazon" to "Am*zon" (for example).
Same, I write the message then take a screenshot and and sent the pic
I tried again - exact same message - and it went through no problem.
I get that often too.