[Gllug] Confusion about the "Sender" field in email headers.

[Alistair Mann]

Progga wrote:
>  Hi all, I am wondering if anybody can clear my confusion about the
>  "Sender" field in email headers.  My understanding is that this field
>  is required when an email server is sending an email on someone's
>  behalf. 

The most recent RFC (5321) does not 'require' the use of a Sender field 
in any circumstance; given that, MTAs and MUAs can put whatever they 
like there, or nothing at all -- and so you cannot assume anything about 
that field's contents, least of all that it complies to a standard.

That changes your question to one about the differences between Drupal 
and Linkedin when viewed after gmail's filters have had a say. As all 3 
are opaque and subject to change without notice, I'm not sure where to 
get it answered!

Cheers,
-- 
Alistair
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