Glad to see you got it working.
As above, please be mindful of the 50/day limit with that forwarder. If the forwarder ends up getting too much email, it can easily get your email service disabled. If that happens, just let us know and we can turn it back on. The best solution for "forwarding" email without actually forwarding it is to turn off forwarding in Plesk and instead set up Gmail as a client to check the mailbox (in Gmail, go to settings->Accounts and Import->Check mail from other accounts, and add the Plesk mailbox). It achieves the same result without you needing to worry about the forwarder exceeding the sending limit.