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Go into that mailbox’s settings in Plesk, then the forwarding tab, then UNcheck the option “don’t deliver copies to the Plesk mailbox”. Once that’s turned off, you should get a copy in the Plesk mailbox and also a copy forwarded to gmail.

I just reviewed your DNS and Plesk settings. Your mailboxes are set up correctly and Roundcube works on the email subdomain. For DNS, I don't see the TXT records for SPF and DKIM, but it's possible I can't see them due to Cloudflare. Those would only affect sending email anyway, not receiving it. Silly question, but with the delivery issue, are you talking about the Plesk mailbox that's forwarded to gmail? Gmail will not accept forwarded mail that originally came from itself, so if you send a message from Gmail to a Plesk mailbox that has been forwarded back to gmail, the message will simply disappear. This is a limitation imposed by Google. Also, for forwarded mailboxes, messages aren't kept in Plesk (and so won't show in Roundcube) unless you clear the "Don't deliver copies to the plesk mailbox" option... Finally, keep in mind that forwarded emails count towards your 50/day limit, so getting a sudden wave of unwanted incoming mail could result in your email service being removed.

You need to select my-domain.com when you first go into Plesk before creating them. They are considered two separate websites. If you go into the settings for email.my-domain.com then create them, the addresses will end up under the email subdomain.

Cheers, Kaz! ?

This is something Wolstech can set up for you. I've escalated this thread for their attention. ?

Added. You'll need to create an A record for it pointed to the IP address is shown in Plesk in order for it to work. It can take up to 2 hours to function. For SMTP and IMAP, use tommy.heliohost.org.