<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Answering my own question: removing the existing mailbox on the receiving system and running again worked. I don’t know why, I think it should have made the existing mailbox equivalent to the reverse-backupped one.<div class=""><div class=""><br class="webkit-block-placeholder"></div><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div>Gerben Wierda</div><div class=""><a href="http://enterprisechess.com/" class="">Chess and the Art of Enterprise Architecture</a></div><div class=""><a href="http://masteringarchimate.com/" class="">Mastering ArchiMate</a></div><div class=""><a href="https://www.infoworld.com/blog/architecture-for-real-enterprises/" class="">Architecture for Real Enterprises</a> at InfoWorld</div><div class=""><a href="https://eapj.org/on-slippery-ice/" class="">On Slippery Ice</a> at EAPJ</div></div></div><div><br class=""><blockquote type="cite" class=""></blockquote></div></div><div><blockquote type="cite" class=""><div class="">On 23 Dec 2019, at 02:28, Steven Smith <<a href="mailto:steve.t.smith@gmail.com" class="">steve.t.smith@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="content-type" content="text/html; charset=utf-8" class=""><div dir="auto" class="">I suggest posting a question to the upstream dovecot mailing list too: <a href="https://www.dovecot.org/mailing-lists" class="">https://www.dovecot.org/mailing-lists</a><div class=""><br class=""></div><div class="">I personally haven’t used doveadm for this task.</div><div class=""><br class=""></div><div class="">Also, you’ll want to upgrade your MacPorts dovecot to the latest version. That version has a vulnerability with a reasonably serious CVE score.</div><div class=""><br class=""></div><div class=""><br class=""></div></div></div></blockquote></div><br class=""></body></html>