Multiple email points?

Optionally: https://github.com/wekan/wekan/wiki/OAuth2#rocketchat-providing-oauth2-login-to-wekan

https://github.com/wekan/wekan/wiki/Outgoing-Webhook-to-Discord

that page also has info about rocketchat

although, depends what kind of emails you need

due dates, etc only

or some other

https://github.com/wekan/wekan/issues/2830

about limiting webhook data

there is also some notification email related settings, that you see with command on server: wekan.help | less

These https://github.com/wekan/wekan/blob/master/docker-compose.yml#L256-L290

just for lowercase for snap commands

Well, then Wekan also has notification drawer like Trello https://github.com/wekan/wekan/issues/2471

Some contributor added it, but I have not yet figured out how it works :D LOL

Well, Wekan is full of features and fixes added by some 180 contributors, during about 5,5 years Wekan has been in development

of real time

combined about 13 years of coding work

Hmm...

or do you mean outgoing + incoming email per board?

like in Trello, that someone can send email and it appears to board?

Adding email settings to board settings

Like this, Feature request: Respond via e-mail, Trello style https://github.com/wekan/wekan/issues/2414

Hmm, maybe I'm going too much off-topic

I think you are just asking for adding server email settings per board

for SMTP server