Handbook - Mail: Upgrade mail chapter
Upgrade mail chapter as part of the handbook working group
Changes:
- Include dma info
- Upgrade sendmail info
- Show how to change dma to use another MTA
- Show how to change sendmail to use another MTA
- Remove Dialup info
- Remove fetchmail info
- Reorg the sections of the chapter
Documentation:
- https://man.freebsd.org/cgi/man.cgi?query=dma
- https://wiki.mageia.org/en/Dma_Dragonfly_Mail_Agent
- https://www.dragonflybsd.org/handbook/mta/
- https://herrbischoff.com/2021/10/freebsd-13-simple-outgoing-email-with-dma/
- https://jpmens.net/2020/03/05/simple-solution-for-outgoing-mail-from-a-freebsd-system/
- https://wiki.archlinux.org/title/Dma
- https://forums.freebsd.org/threads/dma-makes-sense.52219/
PR: 261536
Reviewed by: bapt, bcr, dbaio, jrm
Differential Revision: https://reviews.freebsd.org/D42009
Sponsored by: Daifressh