This is the source to build a Docker image that will let you run temporary IMAP and SMTP servers sandboxed on your local machine, in a way compatible with Geary.
Build the Docker image:
sudo docker build -t test .
Run the image:
container=`sudo docker run -d test`
Find the IP address of the running image:
sudo docker inspect $container | grep IPAddress | cut -d: -f2- | tr -d ' ",'
The image's root password is root, and there's also a normal user named test, password test. You can ssh in if you need to examine things.
Now you can configure Geary. Add a new "Other" account with the email address test@example.com. Use the image's IP address as both the IMAP and SMTP server. Use test/test as the user/pass for both. Set Encryption to None for both as well.
The SMTP server will accept mail to test@example.com.
When you're done testing, stop the running image:
sudo docker stop $container
Copyright 2014 Yorba Foundation
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.