This is not a SFW instance. NSFW communities will be tagged, and efforts will be made to keep SFW communities clean, but proceed at your own comfort level.
In “The UNIX Programming Environment” from 1984, mail is described like this:
“Sending mail to someone is straightforward. Suppose it is to go to the person with the login name nico.
$ mail nico
Now type in the text of the letter
on as many lines as you like…
After the last line of the letter
type a control-d.
ctl-d
$”
This is also why SMTP is such a fucked up protocol. It was designed so that you could just follow the email protocol by hand. HTTP as well followed this philosophy (up to 2.0 at least). A decade or so ago there was a bug in outlook where you couldn’t have a line with only a period in it because that’s the end-of-email signal in SMTP.
In “The UNIX Programming Environment” from 1984, mail is described like this:
“Sending mail to someone is straightforward. Suppose it is to go to the person with the login name nico.
$ mail nico
Now type in the text of the letter
on as many lines as you like…
After the last line of the letter
type a control-d.
ctl-d
$”
This is also why SMTP is such a fucked up protocol. It was designed so that you could just follow the email protocol by hand. HTTP as well followed this philosophy (up to 2.0 at least). A decade or so ago there was a bug in outlook where you couldn’t have a line with only a period in it because that’s the end-of-email signal in SMTP.