NodeJS email auto-responder, with notes
Enabling procmail email parsing is always a bit of a frustrating exercise, since none of the standard tool chains are built for it.
The attached actually work for mail sent to node_process@example.com, using an 'off-the-shelf' $5/month Fedora linux VPS,
running postfix in its default configuration (using virtual-servers as the routing mechanism for multiple sites).
In addition, there's a version that includes a outgoing mail component, also proven to work on the same 'off-the-shelf' configuration.
npm install mailparser
cp dot_procmailrc ~/.procmailrc && chmod 600 ~/.procmailrc
mkdir ~/Mail
The easiest way to capture a 'live' email is to do 'show original' within the drop-down box on the right-hand-side of gmail.
Simply save that raw text file as mail-example.txt and pipe it into procmail.js as follows :
cat mail-example.txt | node procmail.js
The same incantation works for ```procmail_with_response.js`` - but it would make sense to check out the internals first (particularly since your email provider may want the sending address to match the origin SMTP server).