Seeing as Plusnet are not doing FTTP I will shortly be leaving to move to BT.
What happens with your Plusnet email address - does it stay active?
Can you forward emails to another mailbox ?
Fixed! Go to the fix.
You can request that your account is changed to an 'email only' account, which currently is free. That will enable you to retain your PlusNet email addresses.
You need to request this prior to the account being closed. You will lose access to emails for a short period ( a day or two ) as the process to revert to an email only is somewhat manual. The account closue will delete all the mailboxes and then they need to be manually restored by Plusnet. I'd suggest you ensure that all email is saved and you make a note of any mailbox names and passwords before the account closure.