Unfortunately, due to a large number of signups from spammers using gmail accounts, I have had to take the decision to ban new accounts using @gmail.com addresses.

This will also mean that if you try to change your existing email address to an @gmail.com address, it will fail as it is on the banned list.

Existing users who currently have a gmail account registered as their contact email will continue to be able to use this without issue.

I wish I did not have to take such action, however it is unavoidable due to the number of accounts that are from spammers.