dovecot pre-install issue

[Thierry de Montaudry]

> On 16 Nov 2016, at 11:06, soumitri at iitk.ac.in wrote:
> 
> Hello all,
> 
> I am going for a dovecot director based setup (2 director+ 2 imap), more imap servers will be added later  depending on demand/load. Presently I have 12000+ dovecot users with Maildir quota varying from 1 GB to 20GB. (peak hour IOPS 50000+)
> 
> I am having 2 options in choosing dovecot version.
> 
> 1) Old stable release. I.e RHEL, with prebuilt binary. This will be having less trouble in managing. Why RHEL still using version 2.2.10.
> 
> 2) Latest release with best features and lesser known bugs. I.e CentOS7 with with latest compiled version. I have to be more involved if a bug is found.
> 
> I will prefer a less admin work after the setup, with all/most features working.
> 
> If you have a recent similar setup/dovecot gurus, Pl. suggest.
> 
> With thanks & regards,
> 
> -- 
> 
> Soumitri Mishra
> http://home.iitk.ac.in/~soumitri/

Hi,

Running since about 6 month a new setup with 2 directors and 12 IMAP/POP3/LMTP/Sieve servers for mail storage (Maildir), to handle  500K+ users, all straight of CentOS 7 (good old yum and dovecot 2.2.10). It works very well, install is straight forward, event though it needs a bit of optimisation for this kind of traffic. Each user is assigned an IP for the redirection, which dovecot handles very well. And the deployment of new storage machine can be done in less than 30mn.
I didn’t have any problem with bugs up to now. But knowing that most access is done via a webmail interface (Roundcube) or POP3, we are not confronted with specific clients and IMAP problems you see now and then.

Hope this help. Regards,

	Thierry