postmaster_address parameter scope

[mabi]

Hello,

I was wondering when I define the following dovecot parameter:

postmaster_address = postmaster at 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 at mydomain.com
}

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

Regards,
Mabi