Private message marked as spam

Hello,
I was having a conversation via PM with another member of this board, and everything was going fine. However, I am unable to send my most-recent message, as the site is flagging it as spam for some reason. For the record, I have exchanged a grand total of 4 messages with this other person, all over the span of a week. I really don't see how that is spamming.
What should I do about this?
I was having a conversation via PM with another member of this board, and everything was going fine. However, I am unable to send my most-recent message, as the site is flagging it as spam for some reason. For the record, I have exchanged a grand total of 4 messages with this other person, all over the span of a week. I really don't see how that is spamming.
What should I do about this?