Ed W a écrit : > Mathieu Kretchner wrote: >> kbajwa a écrit : >>> Hello: >>> >>> I think you are missing a point which is most important, i.e., what >>> type of >>> support Cyrus vs Dovecot offers. In my experience: >>> >>> Cyrus = 0 >>> Dovecot = 100 >>> >>> >>> My personal experience. >>> >>> Kirt >>> >> I guess you've right but I can't post this answer at Cyrus mailing >> list. I'm just trying to have my own opinion of imap server and I >> already have sarcastic answer on the cyrus mailing list ! > > Reading the cyrus list I think the above quote might be a bit unfair and > accidently crossposted? > > In any case I only have experience of dovecot and it's used in some > larger installs such as the old webmail.us, now 1&1 (I believe). I > think your installation is probably large enough that you might want to > do a trial migration of a couple of accounts and see if migration is a > problem.
I'm trying to migrate my own account from cyrus to dovecot with the 2 tools which seems to fit the most my needs : cyrus2courier : Work fast and well but I must use cyrus2courier-1.5.ts and I have 2 problems with it : falg unseen (or seen if I want) for all e-mail / Sub folders of Inbox are invisibles (I see them on the File System) ! imapsync : Must add a transition configuration to dovecot in order to have user passdb file (or master user) but once done it's ok and work correctly. I've just tested a transition and I'm happy to see it keeps all flags (seen/unseen too) and timestamp but as cyrus2courier, I can't see my inbox sub folders although I could see them (full) on the File System? > Certainly for all new servers I would STRONGLY recommend some > sort of virtualisation option (I use linux vservers, lots of other > options available). This makes it fantasically easy to boot up (say) > three instances of your target software installation, perhaps all with > different configuration options and compare them easily. I used this as > a solution to migrate from Courier and also recently when I was > migrating from 32bit to 64bit guests - essentially you spin up your new > guest, get it all ready, test it like made and then in a couple of > seconds you can down the live guest and boot up the new guest. I > separate out all signficant data from the guest partition so try to keep > the actual installations under a couple hundred MB each (even that feels > bloated, but hey) and this makes it simple to boot up a copy of a guest > to test some change without having to copy too much > > I personally picked dovecot because I worried about the horror stories I > read about with cyrus. However, both are clearly the two best options > available for opensource solutions right now and both are used in large > installations so you should be very happy with either. > > With regards to functionality it would appear (I don't use cyrus) that > cyrus has more "admin tools" to do stuff, but Dovecot is built to be > more "hackable", for example you can easily run a script before each > (imap, etc) login and hence do some very advanced stuff through that > route. Plugins also appear to be quite easy to write to extend dovecot > in new directions > > On the cyrus list they mentioned email retention policies. Now some > people are going to say that this is really a job for the MTA > (postfix/sendmail/etc). However, you have some plugins which might get > you partly towards solving that need, but nothing out of the box which > would give you a cast iron (stand up in court) kind of archiving > control. However, you can get close I think > > Ed W
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