On 02 Dec 2015, at 10:25, Peer Heinlein <p.heinl...@heinlein-support.de> wrote: > > > > We're using > > doveadm -o imapc_user="$USER" -o imapc_password="$PASSWORD" -o > imapc_host=$SERVER1 -o pop3c_user="$USER" -o pop3c_password="$PASSWORD" > -o pop3c_host=$SERVER1 -D -v backup -R -u "$USER" imapc: > > to migrate Mails from Courier to Dovecot. > > > We have some complaints on the old system that there are changes on the > old system where delete mails are appearing again (IMAP) and/or mails > are downloaded several times (POP3). > > AFAIK there can't be changes on the old system if "backup -R" is used. > > Or is there any situation where changes on the old system (where we > connect with imapc) may happen?
No.. There really shouldn't be any changes to the source when doveadm backup is used. I can't think of any reason for the behavior you're seeing. You could enable pop3c_rawlog_dir and imapc_rawlog_dir though to see what dsync is doing.