Postfix email fix

[bradymiller]

Need to troubleshoot and fix this.
First plan to see if still working in old demos.
Then will get it to work in new demos (ubuntu and alpine)

[bradymiller]

This appears to be:

1. Need to run postfix start in the demo script for the ubuntu dockers (DONE)
2. Need to go through steps with aws to allow sending out email from an ec2 instance (PENDING)
   (if can't the ec2 to work, then may need to send through Amazon SES service; d/w @robertdown what he needed to do to get emails up and running on the forum/chat)
3. (will figure out alpine when get above working in ubuntu)

[bradymiller]

In addition to above, have made following changes in ubuntu 16.04 Dockerfile:
https://github.com/openemr/demo_farm_openemr/blob/master/docker/pre-openemr/16-04/Dockerfile#L40-L43
(if this works, then will need to get this going in the other Ubuntu version Dockerfiles)

[bradymiller]

Getting very close to completing this. Using Amazon's SES email service and working well on initial testing.

[bradymiller]

Now working well on the ubuntu dockers.
Still need to get it to work on the alpine dockers.(will need to have separate config files for ubuntu vs alpine)

[bradymiller]

On alpine dockers getting close. postfix/stunnel is working when send email via sendmail commandline. Just need to figure out why not working from wordpress.

[gutiersa]

@bradymiller
Where you ever able to get this working?
I am trying to use postfix and smtp