Yes, GMail accounts will need a cooling off period before being able to post.
We get spam on the board most days. I have seen a demo video of a piece of software that will create a new email account and then start using it to register and post on
numerous forums. The argument was that the practise was not spamming (unsolicited email) and that the software tried to post in forums with names like "Spam", "Off Topic", etc., so as not to be too intrusive.
As a moderator who has to clean up after these things I have a slightly different opinion.

Thankfully the members here are vigilante, and report spam quickly, so it tends to be removed quite quickly (we have moderators in various timezones).
Anyway, welcome to the board.