Re: E-mail solution for 15,000 users

On 03/09/2017 09:03 AM, Manvendra Bhangui wrote:
> On 9 March 2017 at 19:18, Chitta Mandal <[email protected] 
> <mailto:[email protected]>> wrote:
>
>     With a large number of users, the files would have to be distributed
>     over a number of file servers. A single IMAP server and web based MUA
>     are likely to become bottlenecks. What would be a good solution there.
>
> That is what IndiMail allows you to do. You can have multiple servers 
> with its own filesystem and users.
> In fact IndiMail allows you to have an heterogenous environment. e.g. 
> The crazy CXOs who love M$outlook and exchange can have an exchange 
> server as part of the mix. Indimail has a MySQL control table named 
> hostcntrl where you can maintain which user belongs to which server. 
> This is known as a clustered setup. The deliver agent, qmail-remote, 
> qmail-lspawn, qmail-rspawn were modified to do a username lookup and 
> deliver the email to the correct mail server. The 1.2 million active 
> user setup I mentioned earlier were on 6 HP Proliant DL360 Dell 
> servers and one E3500 Sun Microsystem server have Veritas Filesystem 
> VxFS. The clustered setup is described here 
> https://sourceforge.net/projects/indimail/files/indimail/indimail-1.9.1/README-CLUSTER
> A pictorial representation of this setup can be seen here 
> https://sourceforge.net/projects/indimail/#screenshots

I put together these docs around a qmail-ldap setup a few years ago, 
which may be of potential interest:

http://www.fritzhardy.com/projects/email/