Clarify that the _application_ sends email…

…to the authority
Rephrase explanation for clarity
Clarify script/mailin error handling
Explicitly recommend backing up incoming mail
Split “Other Mail” in to distinct sections

- Transactional mail
- Tracks mail
- Automatic bounce handling (optional)
em-dash instead of comma
Use active voice
Minor rewording
Minor clarifications and active voice
Brevity and active voice
Reword for consistency with transactional mail example
Use smaller sentences.
Minor tweaks to configuring bounce handling
Split bounce handling note in to smaller sentences
Add link to clarify bounce handling note
Use cat to append to /etc/postfix/master.cf
Use cat to append to /etc/postfix/main.cf

Also clarify that mydestination requires a manual edit of the file
Improve postfix backup email section
Improve clarity of sending foi+ mail to the pipe
Clarify where @example.com comes from in /etc/postfix/recipients