I found a few incorrect limitations in GAIA.
1. The email address can't handle a + sign. It is a valid character in the account name as many servers allow it to distinguish between multiple uses of the same account.
2. The backslash is not allowed in a crontab entry. But in some cases you need it. For example I like to keep the local backups in check with:
/bin/find /var/log/CPbackup/backups/ -ctime +7 -exec rm {} \;
But the backslash is not accepted in GAIA.
To be fair, I've seen many other things "reject" plus as part of an email address unrelated to Check Point
That said, maybe these are small areas we can improve.
Alexander Kim