Michael, it seems the rumors are right. After shortening the file /etc/ssl/ca-certificates.crt to one entry, it works. Of course this is not a solution, so a fix will be needed. I use the "/etc/ssl/certs/ca-certificates.crt" which is included with Ubuntu impish yours sincerely Robert Am 29.10.2021 um 21:09 schrieb Michael Kliewe: Hi, I have heard rumors that this happens when you provide a CA bundle file which is big. If you just provide a single CA file it works. Something has changed there, maybe the developers have more details about this change. King regards Michael Am 29.10.2021 um 19:25 schrieb Robert Nowotny: Dovecot 2.3.17 can not start - too many parameters. but the same config is working on 2.3.16 (and for a long time already ...) started via systemd unit file : =================[Unit] Description=Dovecot IMAP/POP3 email server Documentation=man:dovecot(1) Documentation=http://wiki2.dovecot.org/ After=local-fs.target network.target dnsmasq.service NetworkManager-wait-online.service network-online.target Requires=network.target network-online.target dnsmasq.service local-fs.target [Service] Type=forking ExecStart=/usr/local/sbin/dovecot -c /etc/dovecot/dovecot.conf PIDFile=/usr/local/var/run/dovecot/master.pid ExecReload=/usr/local/bin/doveadm reload ExecStop=/usr/local/bin/doveadm stop PrivateTmp=true NonBlocking=yes LimitNOFILE=8192 [Install] WantedBy=multi-user.target ================= log: Oct 29 18:48:58 lxc-imap dovecot[1781]: doveconf: Fatal: execvp(/usr/local/sbin/dovecot) failed: Argument list too long Oct 29 18:48:58 lxc-imap systemd[1]: dovecot.service: Control process exited, code=exited, status=89/n/a Oct 29 18:48:58 lxc-imap systemd[1]: dovecot.service: Failed with result 'exit-code'. but when I run doveconf -n, it is working under 2.3.17 I needed to revert to version 2.3.16 to send this email ;-) running on Ubuntu impish yours sincerely Robert Nowotny Rotek GmbH -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://dovecot.org/pipermail/dovecot/attachments/20211029/3e338312/attachment-0001.html>