On 17.02.2013, at 11:08, Timo Sirainen <t...@iki.fi> wrote: > On Sun, 2013-02-17 at 10:44 +0100, Michael Grimm wrote:
>>> Although even if it does, other parts of Dovecot still use only the >>> hostname part to guarantee global uniqueness of things. So better to have >>> unique hostnames. >> >> What parts of Dovecot would be involved? I'm curious because my production >> mailservers use identical hostnames in their jails ever since running >> Dovecot (starting 1.x). > > Mainly that maildir filenames are used as GUIDs. If two have the same > name, they are assumed to be identical. That's why the maildir filenames > include the hostname in them, to make sure that the GUID is different > even if two mails happen to be delivered at exactly the same time with > the same PID and same size to two different servers. So pretty unlikely, > but better to be safe. :) Ok, that won't hit me for the time being because I am using mdbox. > There may be some other features that require unique hostnames in > future. Anything where multiple Dovecot servers need to communicate > between each others. If some day there is such generic communication > between Dovecot servers I'm planning on enforcing this requirement. Thanks for that clarification. Thus I will need to think about different hostnames, although that implies "no more just copying config files between both servers that imply identical hostnames at both sites" ;-) Regards, Michael
