Postfix - Passing email to a script

[Mike Marchywka]

On Fri, Jan 29, 2021 at 06:58:29PM +0000, David Fletcher wrote:
> Hi all,
> 
> I'm developing a solution for distributing GPX route files to those who
> want to use them on smartphones instead of paper printed directions for
> navigating suggested routes with a classic car club. My idea is to give
> to anybody who wants the GPX file an email address which will trigger
> my mail server to send a reply with the GPX file attached.

I'm not sure what exists for this but I wrote my own thing 
that is basically for what you suggest. Right now, I'm using 
fetchmail and some scripts to monitor a yahoo account and
send back camera or other information from a remote machine
with no fixed IP address using neomutt. I'm in the process of making
a more integrated c++ version using a library I made
from neomutt as well as libetpan. I call the thing "mikemail"
for now and the only reason to discuss it so far
is this thing on collecting diet diary information and
returning reports, 

https://www.linkedin.com/posts/marchywka_adding-artwork-activity-6748265617696059392-b3Ej

Thee are probably a lot of systems that do this as automated
email echanges are common. However, I got started on a bunch of
pieces and it seemed useful to integrate it and get rid
of things like fetchmail.  



> 
> At the moment I have working from the aliases file:-
> emailexperiments: "|/home/emailexperiments/autoreplytesting"
> 
> which calls the script
> #!/bin/bash
> 
> read header
> fromaddr=$(echo $header | cut -d' ' -f 2)
> sendEmail \
>     -q\
>     -f noreply at thefletchers.net\
>     -t $fromaddr\
>     -u "Autoreply testing"\
>     -m Autoreply from server
> 
> Put together from results of various Google searches. This appears to
> be working so far, tested by me from my own server and a friend using
> gmail. All I then need to do is add the attachment to the sendEmail
> call.
> 
> The read command appears (IANAE) to fetch the next line from the email
> with each call. So far that first line contains
> From address at example.com etc etc
> BUT my question is, will it ALWAYS be the first line that contains the
> sender's address or do I need to use a loop to make certain I always
> find it?
> 
> Thanks as always to all those who know and understand more than I do!
> 
> Dave
> 
> 
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-- 

mike marchywka
306 charles cox
canton GA 30115
USA, Earth 
marchywka at hotmail.com
404-788-1216
ORCID: 0000-0001-9237-455X