Thank you Aki for the reply. 

But I cannot disturb the version at present as it is a live server and thousands of emails will circulate every hour.

Could you please suggest me how to create HA/resilience for the existing environment. I have another server ready with the similar configuration. Please provide any steps/link for me to proceed on this? It will be a great help to me.

Thanks,
Kishore

On Thu, Jan 9, 2020 at 4:33 PM Aki Tuomi <aki.tuomi@open-xchange.com> wrote:

> On 09/01/2020 18:25 Kishore Potnuru <kishore.reachme@gmail.com> wrote:
>
>
> Hi Dovecot team, 
>
> I need help in configuring HA/resilence for my dovecot (POP3/IMAP) server.
>
> I have one RHEL Linux POP3/IMAP server with Dovecot version 2.2.10. I also installed the postfix(version: 2.6.6) in it. At present it have around 10 domains and each domain is having around 20 email boxes. It has very simple configuration.
>
> User's reading the email via some internal applications/Outlook.
>
> I would like to create resilience/HA for this environment. Could you please suggest me, what is the easiest way to achieve this?
>
> If any one can suggest step by step that will be more helpful to me.
>
> Thanks,
> Kishore

You could consider using more recent version of dovecot. 2.2.10 is already over 5 years old.

Aki