I work at a university, where we have staff members who can also teach as an adjunct faculty member. We issue an account for the individual based on their name, so Joe Smith would get smithj@domain.edu. and it is up to them to sort through their mail for staff content versus adjunct content.
HR wants these individuals to have 2 accounts, one for their staff work and one for their adjunct work so the two are completely separated. One reason being that if the staff role is terminated for any reason, they shouldn't have access to their staff content, but could still continue in their adjunct role. Using the previous "Joe Smith" example they would keep their smithj@domain.edu account for staff work, and get the next iteration of our naming scheme as an additional smithjo@domain.edu for their adjunct account.
I don't want to do this for a number of reasons:
Some options we have thought of:
Has anyone else experienced a similar situation, and if so how did you deal with it?
I don't see anything wrong with the HR plan. It makes sense to me to keep the emails separated by role. If the additional licensing cost is approved then my opinion would be to go with it.
You have a point about a user accessing email sent to one role from the other role, but I think the point is to take appropriate steps to keep the roles distinct and unique, not to close any and every possible loophole that exists. If that were the case then you'd have a lot more work to do, and not just regarding email.