Michel Sébastien Sebastien.Michel at
Tue Sep 21 05:10:59 EDT 2010

>> where does Cyrus IMAPd stand today?
>> When I was starting to think about moving to a open source mail system
>> (migrating away from Lotus Domino btw.), there ware Cyrus IMAPd, Courier
>> and UW-IMAP I think.
>> Cyrus was the only "full flavored" IMAP server with active development.
>> We were going the 2.2. path, while 2.3 seemed to "fresh". So there was
>> development.
>> On the other side there were still many people complaining about Cyrus
>> being too complex and too unstable with all the BDB fiddlings.
>> Then dovecot emerged and quickly evolved. I don't know why,

> I begin to be tired from this "dovecot is much more besser, you HAVE TO USE IT", why don't you migrate, ... ...?
> For me, this is a typical open source crowd behaviour. If one product tends to have better results, change immediately on the faster running > train (which is believed to run faster) and to dump the reliable solution immediately, beginning to do advocacy in all forums, newsgroups and > discussion groups to tell people that the new product is even better than sliced bread.

Personally I like the competition, it encourage the continuous improvement of open source software. Dovecot has some good ideas or design solutions (see this rackspace document about Dovecot. It indicates that Apple did the switch from Cyrus to Dovecot )

We run Cyrus for years and are happy with it. We host nearly 30 million mailboxes on our biggest platform. But begin to have mailboxes with hundreds of thousands of emails and it becomes difficult to balance the storage. I don't know what is really sharding in dovecot, but I would like to have a virtual storage in Cyrus (emails localized in an IMAP folder stored on several storage nodes).


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