hi Jerry

Not sure how helpful this is, but I mention it just in case

https://dmatthews.org/java_email.html#imaps

discusses imaps with james.

I use a self signed cert and TBH not sure what extra LetsEncrypt offers you 
over that, but I produce the key with

keytool -genkey -alias james -keyalg RSA

and from 

https://letsencrypt.org/docs/integration-guide/

"Let’s Encrypt accepts RSA keys from 2048 to 4096 bits in length"

--
David Matthews
m...@dmatthews.org


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