Not sure if this is what you are looking for...

But the following link has lots of rpms for dovecot aarch64 / arm64. 

They do all say [dovecot-devel...[]] so I’m not sure if they are stable versions or something else (requirements for development) ??

It’s hard to tell when using my phone as the screen is much too small !

https://pkgs.org/download/dovecot-devel

On Fri 4 Dec 2020 at 10:39, David Pottage <david@chrestomanci.org> wrote:

On 2020-12-03 21:41, Peter Cooper Jr. wrote:
> Hey, I really appreciate Dovecot being available with standard repos
> in repo.dovecot.org. I'm currently using the "CentOS 7" one on Amazon
> Linux 2 and it works great for x86_64.
>
> I'm wondering if there are any plans for also providing arm builds
> (aarch64) at some point? Or if they're available somewhere else
> already? I may play around with compiling things myself, but just
> downloading an official package is generally the easier way to go so I
> thought it couldn't hurt to ask.

It won't help you for CentOS, but the Debian project includes Arm64
(AKA aarch64) as one of their standard supported processor architectures
and dovecot is one of their many standard supported packages. eg:

https://packages.debian.org/stretch/dovecot-core

Is Arm64/aarch64 an official supported architecture in CentOS? If so I
would
look in the standard repositories for dovecot packages. If not then I
would
suggest that it is not a good idea to use an unsupported Disto/Arch
combo
unless you are very familiar with building everything from source.

--
David Pottage