Yes, below is the high level mail interface for Luan. But note that it is still a thin layer.

local Mail = require "luan:mail/Mail.luan"

Mail.sender{
    host = "smtpcorp.com"
    username = "smtp@luan.software"
    password = "luanhost"
    port = 2525
}.send{
    From = "smtp@luan.software"
    To = "fschmidt@gmail.com"
    Subject = "test"
    body = [[
testing
1
2
3
]]
}

and

local Mail = require "luan:mail/Mail.luan"

Mail.sender{
    host = "smtpcorp.com"
    username = "smtp@luan.software"
    password = "luanhost"
    port = 2525
}.send{
    From = "smtp@luan.software"
    To = "fschmidt@gmail.com"
    Subject = "test attachment"
    body = {
        {
            body = "see attachment"
        }
        {
            ["Content-Disposition"] = [[attachment; filename="test.txt"]]
            body = [[
testing
1
2
3
]]
        }
    }
}