* Timo Sirainen schrieb am 26.01.16 um 16:00 Uhr: > > > On 26 Jan 2016, at 15:56, Marc Schiffbauer <m...@sys4.de> wrote: > > > > * Sami Ketola schrieb am 23.01.16 um 23:27 Uhr: > >> > >> > >> On 23/01/16 15:33, Robert Schetterer wrote: > >>> for multiple advanced imap settings at migration you might use > >>> imapsync not dsync Best Regards MfG Robert Schetterer > >> Sure but imapsync does not preserve message UID's which means that users > >> end up redownloading all their messages or message/UID mismatches will > >> happen. > > > > IIRC that is not true. Some years ago I migrated a server to dovecot and > > managed to do it with proper UID migration. No clients were required to > > re-download Mail. Nor over IMAP neither POP3. > > IMAP protocol doesn't have a way for clients to specify UIDs. > Especially UIDVALIDITY can't be preserved in any way. IMAP clients > don't necessarily make it clearly visible that they're redownloading > mails though. With POP3 clients if they use the keep-mails-on-server > it pretty much has to redownload mails as duplicates. Unless the UIDL > was based on some email headers or such, the POP3 UIDL can't be > preserved either.
IDNRC ;-) Then I am pretty sure that I used dsync. Because I AM sure that I had no issues with re-dpwnloadeing and that I had an eye on especially on that. -Marc -- [*] sys4 AG http://sys4.de, +49 (89) 30 90 46 64 Franziskanerstraße 15, 81669 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
