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Written by Oleksandr Gavenko (AKA gavenkoa), compiled on 2017-01-30 from rev ccaa2f364422+.

Mail.

Message headers fields.

from            =       "From:" mailbox-list CRLF
sender          =       "Sender:" mailbox CRLF
reply-to        =       "Reply-To:" address-list CRLF

to              =       "To:" address-list CRLF
cc              =       "Cc:" address-list CRLF
bcc             =       "Bcc:" (address-list / [CFWS]) CRLF
newsgroups

http://tools.ietf.org/rfc//rfc2076.txt
              Common Internet Message Headers, Informational
http://tools.ietf.org/rfc/rfc2822.txt
              Internet Message Format, Standard Track
http://tools.ietf.org/rfc/rfc2821.txt
              Simple Mail Transfer Protocol, Standard Track

Sending mail with ssmtp.

$ cat /etc/ssmtp/ssmtp.conf
Mailhub=smtp.gmail.com:587
FromLineOverride=YES
UseSTARTTLS=yes
AuthUser=gavenkoa
AuthPass=XXXXXX

Sending email via gmail in emacs.

; install starttls from here (no need for patch)
; http://josefsson.org/emacs-smtp-starttls.html

(setq send-mail-function 'smtpmail-send-it
   message-send-mail-function 'smtpmail-send-it
   smtpmail-starttls-credentials
   '(("smtp.gmail.com" 587 nil nil))
   smtpmail-auth-credentials
   (expand-file-name "~/.authinfo")
   smtpmail-default-smtp-server "smtp.gmail.com"
   smtpmail-smtp-server "smtp.gmail.com"
   smtpmail-smtp-service 587
   smtpmail-debug-info t
   starttls-extra-arguments nil
   smtpmail-warn-about-unknown-extensions t
   starttls-use-gnutls nil)

Update ~/..authinfo:

machine smtp.gmail.com login [your name]@gmail.com password [your password]

And finally download, unzip, make and install startttls:

http://josefsson.org/emacs-smtp-starttls.html
https://support.google.com/a/answer/33915
Configuring Your MX Records: Other domain hosts.

Mail etiquette.

Bottom vs. top quoting.

Just not use top quoting!

Storage format for email.

mbox.

http://tools.ietf.org/html/rfc4155
The application/mbox Media Type (Category: Informational)
http://en.wikipedia.org/wiki/Mbox
Mbox at Wikipedia.