Additional context.

I've also removed the quote wrapping around the value of hostname in 15-lda.conf, I don't think that was necessary / intentional.

postmaster_address

postmaster_address is technically related to #3769

mail_plugins appending sieve - LDA vs LMTP protocol config blocks

mail_plugins with sieve being hard-coded was introduced with original sieve support: #166 (comment)

/etc/dovecot/conf.d/15-lda.conf is provided from the dovecot package install, while we're replacing the 20-lmtp.conf with our own copy when DMS Dovecot was switched to LMTP.

This is the content as of debian:12-slim image with dovecot-lmtpd package installed:

##
## LMTP specific settings
##

# Support proxying to other LMTP/SMTP servers by performing passdb lookups.
#lmtp_proxy = no

# When recipient address includes the detail (e.g. user+detail), try to save
# the mail to the detail mailbox. See also recipient_delimiter and
# lda_mailbox_autocreate settings.
#lmtp_save_to_detail_mailbox = no

# Verify quota before replying to RCPT TO. This adds a small overhead.
#lmtp_rcpt_check_quota = no

# Add "Received:" header to mails delivered.
#lmtp_add_received_header = yes

# Which recipient address to use for Delivered-To: header and Received:
# header. The default is "final", which is the same as the one given to
# RCPT TO command. "original" uses the address given in RCPT TO's ORCPT
# parameter, "none" uses nothing. Note that "none" is currently always used
# when a mail has multiple recipients.
#lmtp_hdr_delivery_address = final

# Workarounds for various client bugs:
#   whitespace-before-path:
#     Allow one or more spaces or tabs between `MAIL FROM:' and path and between
#     `RCPT TO:' and path.
#   mailbox-for-path:
#     Allow using bare Mailbox syntax (i.e., without <...>) instead of full path
#     syntax.
#
# The list is space-separated.
#lmtp_client_workarounds =

protocol lmtp {
  # Space separated list of plugins to load (default is global mail_plugins).
  #mail_plugins = $mail_plugins
}

The only difference is we change the mail_plugins line (config reference as of DMS v14).

Some of the other settings may have relevance to support/document, but we could delete our outdated git copy of this config and apply the same mail_plugins change as this PR does with LDA.

I'm not sure if a future 2.4 Dovecot package in debian will affect these configs, or if Debian/Dovecot will continue to supply them as defaults to /etc/dovecot/conf.d 🤷‍♂️

This was opened against the v15.0.0 milestone. Do you think you can cram this in? It is probably fine because we are waiting on the ClamAV CVE fix, right?

Do you think you can cram this in? It is probably fine because we are waiting on the ClamAV CVE fix, right?

Yeah this change should be fairly minor. There's no rush to get this change in, just a drive-by improvement while I was looking into something else.

I can add a changelog entry if you like, but logically nothing should have really changed, just shifting around the same logic and improving the sed expression. Although hostname will no longer quote the value, but I don't think it should have been to begin with.