I2P support forum

I wonder if it's possible to add susimail to i2p android version.

It is possible but would require an additional I2P router setup (non-phone version).

As on desktop I2P, you may on Android use any email client, pointing SMTP to localhost:7659 and POP3 to localhost;7660.

We have no plans to add our own email client to Android.

To the extent that any resources for Android development materialize at all, our priorities are:
1) Router app fixes / maintenance
2) I2P-Bote fixes / maintenance
3) New features and improvements in the router and bote.

Way way further down the list, but still probably higher than susimail, would be a bittorrent client.

Thanks for zzz's reply.

Now I know about it.