[Exim] suffices and aliases

That's me again.

When I have something like:

some_director:
suffix = -somesuffix
driver = aliasfile
# ...

The resulting local-part lacks `-somesuffix'.
Is there any way to make aliasfile produce localparts with suffices?

For example, now if I have alias `al' to user `alex' I get `alex' from
`al-somesuffix'. But I'd like to get `alex-somesuffix' instead.

Is that possible?

Exim is 3.33.

                   Ingvarr.