Pound on Dovecot with mailer.nim script

[Bob Gustafson]

For testing mail programs (postfix and dovecot), it is reasonable to use 
a scripted client application on a separate machine.

Scripting started with unix shell scripts, but got a big boost with Sol 
Libes' tcl/expect.

 From those early days, we now have 'puppet', 'chef', 'fabric', 
'ansible', ... to test and manage complex multi-machine systems.

A relatively new scripting entry is 'nimscript'. The underlying code is 
'nim' and nimscript shares the same syntax as nim. (Not necessary to 
learn a separate language such as ruby, python or tcl).

Nim and Nimscript have a number of explicit parallel operators in an 
asyncdispatch library. newAsyncSmtp and 'await' are some of the features 
used in this script. The script can be used as a library module for a 
custom application or it can be run as a standalone sample script. The 
phrase 'when isMainModule:' detects when it is run as a standalone.

Being based on Nim - means that it works on Windows-MacOS-Linux-(and 20+ 
other OS), so no portability problems. Nim is a compiled language with 
GC and is as fast as 'C'.

Take a look at 
https://christine.website/blog/how-send-email-nim-2019-08-28 for more 
information. And there is 'nim-lang.org' too.