I had the same problem with maildrop and notmuch. I figured out that exim is
adding the From_ line, but it can be disabled. Something similar is probably
true of other MTAs.
The default value for message_prefix in the exim pipe transport looks like
this:
message_prefix = \
From ${if def:return_path{$return_path}{MAILER-DAEMON}}\
${tod_bsdinbox}\n
You can disable it by adding 'message_prefix = ' to your maildrop_pipe
transport, this is mine:
maildrop_pipe:
debug_print = "T: maildrop_pipe for $local_part@$domain"
driver = pipe
path = "/bin:/usr/bin:/usr/local/bin"
command = "/usr/bin/maildrop"
message_prefix =
message_suffix =
return_path_add
delivery_date_add
envelope_to_add
I'm probably going to file a separate bug against exim requesting that the
Debian exim config for maildrop_pipe doesn't add a From_ line.
--
Edward.
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