lib-storage: Allow mail_*cache_fields settings to specify any hdr.* fields. Also the fields were previously set only once globally, so if the process served multiple users, it wouldn't have been possible to use per-user values for these fields.
lib-storage: Allow mail_*cache_fields settings to specify any hdr.* fields.
Also the fields were previously set only once globally, so if the process
served multiple users, it wouldn't have been possible to use per-user values
for these fields.

LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot