This is an added layer of security and below is an extract from the FAQs
https://m.fabguys.com/articles/faq
"I am getting asked to enter a code when sending a message to prove I'm not a spammer? I'm not!!!
Don't worry, this is normal and we do this to protect everyone on the site. After a few days of using the site normally you'll probably not see this message again. We hope that having a site free of spam means this small inconvenience is worth it "
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