postmaster_address parameter scope

Hello,

I was wondering when I define the following dovecot parameter:

postmaster_address = postmaster@mydomain.com

in my local.conf config file, does this parameter apply globally?

I mean because it is not inside any {} curly braces does it also appliy to:

protocol lmtp { ... }

or do I need o explicitly define again my postmaster_address parameter inside protocol lmtp{} like this?

protocol lmtp { postmaster_address = postmaster@mydomain.com }

My very same question applies also for protocol lda {}...

Regards, Mabi