Re: [msmtp-users] Generating a From: header if it is missing

[grarpamp <grarpamp@...20...>]

On Wed, Nov 12, 2014 at 1:20 AM, Martin Lambers <marlam@...23...> wrote:
> Do you see problems with this approach? Are there alternative
> suggestions?

My only thought is that via some msmtp options it should be possible
to send NULL or literally arbitrary data for any/all elements [1] of the
transaction, even if for no other reason than testing the behavior of your
[own] SMTP server. Such as how the server mangles the mail you give it.
Then this new default approach would not restrict that.

Ex: Some servers will fill in an empty body From with either your envelope
From, or its notion of your account From they have in say LDAP, yet if you
supply a body From in the message, it will not make either such replacement.
Some other servers will replace your body From with envelope or account From.

A situation like that, possibly users in production may wish to send no body
>From in order to let/continue the server float that field however it wants. Such
as perhaps following the account From the user sets in webmail.

[1] Which may minimally include any envelope options (from, to, bcc, etc),
any meta/received headers, body headers (from, to, date, subject, m-id, etc),
and any message body content itself.

Note rfc2822 was obsoleted for 5322, the current set for SMTP is below.
 (From header is in rfc5322: section 3.6)
https://tools.ietf.org/html/rfc5322
 Internet Message Format
https://tools.ietf.org/html/rfc6854
 Update IMF to Allow Group Syntax in From: and Sender: Headers
https://tools.ietf.org/html/rfc6531
 SMTP Extension for Internationalized Email
https://tools.ietf.org/html/rfc6532
 Internationalized Email Headers
https://tools.ietf.org/html/rfc5321
 Simple Mail Transfer Protocol