sending mail: include lib or make pod

[borkdude]

Since an email is just plain data, it's a perfect candidate for a pod.
E.g. drewr/postal could be compiled with GraalVM java 8 and then be used from babashka.
Note that we have tried to use drewr/postal before, but this failed due to Java 11 restrictions:
#366
Worked around that (drewr/postal#107), now running into:

javax.activation.UnsupportedDataTypeException: no object DCH for MIME type text/plain; charset=utf-8

$ rlwrap ./bb
Babashka v0.2.2-SNAPSHOT REPL.
Use :repl/quit or :repl/exit to quit the REPL.
Clojure rocks, Bash reaches.

user=> (require '[postal.core :as p])
nil
user=> (p/send-message {} {:from "michielborkent@gmail.com" :to "michielborkent@gmail.com" :body "hello"})
javax.activation.UnsupportedDataTypeException: no object DCH for MIME type text/plain; charset=utf-8 [at <repl>:2:1]

Seems to be the same issue as in: quarkusio/quarkus#1840
Work in progress in branch https://github.com/borkdude/babashka/tree/postal2.

Maybe this Quarkus extension could be wrapped in some Clojure code:
https://github.com/quarkusio/quarkus/tree/master/extensions/mailer
But that wouldn't be the same as postal

More info: https://github.com/babashka/babashka.pods
https://github.com/borkdude/babashka/blob/master/doc/libraries.md#pods

Another lib in this space: https://github.com/toyokumo/tarayo

[borkdude]

There's now a pod available: https://github.com/tzzh/pod-tzzh-mail

[borkdude]

If anyone knows how to make postal to work with GraalVM, I'm willing to take another look.

[drewr]

Thank you for writing this up @borkdude!