Interesting question. Currently totally busy with all the people at rC3
https://socialhub.activitypub.rocks/tag/rc3but also want to know.
Or let's wait for Thunderbird.
Major problem with AP to mail is the drama at Mozilla!
@cubicgarden I’ve not used the email connector in Friendica, but I know it exists. Its description includes “if you wish to communicate with existing email contacts” and its settings seem to connect to an existing mailbox. In case this is what you mean.