lda fails in parse_angle_addr if sieve is enabled

[Bernard Spil]

Hi,

Since updating to 2.3.1 on my FreeBSD mailserver mail delivery using
lda is broken if I have sieve enabled.
(Before updating this was 2.2 and pigeonhole 0.4)

FreeBSD 11.1-p8 amd64
Dovecot 2.3.1
Pigeonhole 0.5.1

Mailflow is OpenSMTPd as MTA, using mda delivery to rspamc which
utlimately delivers using dovecot-lda.

smtpd.conf
deliver to mda "rspamc -h scan --mime -e
\"/usr/local/libexec/dovecot/deliver -d %{user.username}\""
%{user.username} is the local user after virtusers, aliases etc.
verified using a shell wrapper and capturing the username.

conf.d/15-lda.conf
protocol lda {
  mail_plugins = $mail_plugins sieve
}

maillog:
Apr  8 19:36:54 email smtpd[6390]: smtp-in: Accepted message 9db769b1
on session 81939f0d30337a47: from=<user1 at example.org>,
to=<user2 at example.net>, size=2871, ndest=1, proto=ESMTP
Apr  8 19:36:54 email smtpd[6390]: smtp-in: Closing session 81939f0d30337a47
Apr  8 19:36:55 email dovecot:
lda(user2)<21091><Ljv6JzdTylpjUgAAWr0fMA>: Panic: file
message-address.c: line 147 (parse_angle_addr): assertion failed:
(*ctx->parser.data == '<')
Apr  8 19:36:55 email smtpd[6390]: delivery: TempFail for
9db769b13edef5a7: from=<user1 at example.org>, to=<user2 at example.net>,
user=bernard, method=mda, delay=1s, stat=Error ("")
Apr  8 19:36:57 email smtpd[6390]: smtp-out: Closing session
81939f0c09f5140b: 1 message sent.
Apr  8 19:37:04 email dovecot:
lda(user2)<21102><vAChMkBTylpuUgAAWr0fMA>: Panic: file
message-address.c: line 147 (parse_angle_addr): assertion failed:
(*ctx->parser.data == '<')
Apr  8 19:37:04 email smtpd[6390]: delivery: TempFail for
9db769b13edef5a7: from=<user1 at example.org>, to=<user2 at example.net>,
user=bernard, method=mda, delay=10s, stat=Error ("")

Removing sieve from mail_plugins configuration and restarting
Apr  8 19:37:32 email dovecot: master: Warning: Killed with signal 15
(by pid=21106 uid=0 code=kill)
Apr  8 19:37:32 email dovecot: imap(user2)<21085><WGCXullpKzasEQIC>:
Server shutting down. in=774 out=5373 deleted=0 expunged=0 trashed=0
hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0
Apr  8 19:37:32 email dovecot: master: Dovecot v2.3.1 (8e2f634)
starting up for imap, lmtp, sieve
Apr  8 19:37:35 email dovecot:
lda(user2)<21134><tNPZHl9TylqOUgAAWr0fMA>:
msgid=<32984450d041e5c2f887bed5f6512c92 at example.org>: saved mail to
INBOX
Apr  8 19:37:35 email smtpd[6390]: delivery: Ok for 9db769b13edef5a7:
from=<user1 at example.org>, to=<user2 at example.net>, user=user2,
method=mda, delay=41s, stat=Delivered

Mail gets delivered.

Don't understand why it is looking for a <>-address if sieve is enabled.

Cheers, Bernard Spil.