Exim - How to force deliver email from exim mail queue

Platform :
FreeBSD

Mail Server :
Exim

Purpose :
Make Exim to start deliver all frozen messages.

Sendmail - How to test sending email, verbosely using Sendmail

Mail Server :

Sendmail

Purpose :

To verbosely test sending of email using sendmail

Here how :

Prepare a file with name "mail.txt". This will be the email header & contents that we wanna include when test sending this email. The contents of the file should look like below :

RFC 2142 - Mailbox Names for Common Services, Roles and Functions

RFC stands for Request For Comments. Not all RFC documents end up as standards. But it is indeed a good read to find out how standards works. For example, RFC 2142 list emails that should be reserve for its purpose :

FreeBSD - How to make changes to sendmail, FreeBSD styled

Sendmail is the default MTA in FreeBSD. FreeBSD has its own way in managing sendmail's configuration files. Instead of making changes to sendmail.mc, changes should be made to $(hostname).mc. Similarly for submit.mc, changes should be $(hostname).submit.mc.

Here's how :