Getting past spam filters when dropping a link

I've been dropping links on relevant sites all day but I keep coming across sites that say I trigger their spam filter when I drop the link. The thing is every other comment looks exactly the same as mine. What are they doing that I don't know about to get around the filter?

eg.



My comment looks identical to these in format

It could be your site or your email address.

Some sites refer to a database of known spam suffixes for both of these before allowing a comment to pass.

so xxxxx@yourdomainname dot com might trigger spam protection if "yourdomainname dot com" is blacklisted
Likewise, if you are using a generic email address (Gmail, Yahoo whatever) then your site (the one you are creating backlinks for) could be blacklisted.
Most sites don't blacklist, but certain types of sites do have it most times.
Good sites often have spam protection and domain referral procedures in place.
You can Google these blacklisting sites and ask to be removed - or you can pick other platform types to links from - or both.

Scritty