Dear Maintainer, I am trying to use msmtpd as my local smtp server. So far, I cannot get qBittorrent to work with it. When setup individually, qBittorrent can send mail through both exim4 and opensmtpd, and msmtp are able to work together with apt-listchanges, or test emails via sendmail command. However, when configure qBittorrent to send via msmtpd, it doesn't produce any results. qBittorrent's log didn't record anything, dispite it should log errors if something goes wrong during the SMTP session. ``` (N) TIMESTAMP - 'Totally legit torrent' added to download list. (N) TIMESTAMP - Torrent: Totally legit torrent, sending mail notification ``` And there is no new entry in smtp's log. When attempt to produce a mail dump using `--command`, it appears that msmtpd didn't receive anything, as there is no contents piped to command line. I cannot reproduce this problem a Debian 11 Bullseye VM (amd64), with msmtp version 1.8.11 it just works as expected. I can get mail dumped as following: ``` $ cat maildump mail@example.com Date: Sun, 26 Sep 2021 From: qBittorrent_notification@service.example.com Subject: [qBittorrent] 'Totally legit torrent' has finished downloading To: mail@example.com MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 VG9ycmVudCBuYW1lOiBUb3RhbGx5IGxlZ2l0IHRvcnJlbnQKVG9ycmVudCBzaXplOiA4LjYgTWlCClNhdmUgcGF0aDogL2hvbWUvdXNlci9Eb3dubG9hZHMvCgpUaGUgdG9ycmVudCB3YXMgZG93bmxvYWRlZCBpbiA8IDFtLgoKClRoYW5rIHlvdSBmb3IgdXNpbmcgcUJpdHRvcnJlbnQuCg== ``` However, this problem will occur in a Debian 10 Buster VM, with qBittorrent 4.1.5-1+deb10u1 from official repo (though qBittorrent version doesn't matter here, as it all failed including unofficial builds). Upgrade msmtp to Version 1.8.11-2~bpo10+1 from buster-backports WILL NOT fix this issue. I have also raised this issue in upstream, more details and discussions are available here: https://github.com/marlam/msmtp-mirror/issues/59 Regards Reka