Is there a way of having more than one signature per user, and can signatures be easily switched by a user depending of the type of email they’re working on?
There’s only one signature per user. However, normally if you need more than one there’s a better way to do it than signatures.
The users can have no signatures (or just their names) and put the rest of the signature in the email template. Each mailbox can have it’s own public notes to customers template so that you can have different signatures for each email box. Usually that will then be for different products/brands/etc.