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From: Thad Floryan <thad@thadlabs.com>
Newsgroups: comp.os.linux.networking
Subject: Re: ping Moe Trin
Date: Wed, 05 Mar 2014 13:44:42 -0800
Organization: ThadLABS
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On 3/5/2014 11:26 AM, buck wrote:
> I am searching for an RFC that says an Email header may contain a blank 
> SENDER.  I'm sure I read that the SMTP server must not reject messages 
> where the SENDER is blank, but darned if I can find it now.
> 
> Can you please provide a link (or your usual better information)?

I'm not Moe but your question interested me.

Googling "RFC that says an Email header may contain a blank SENDER"
without the quotes provides what you seek.

Thad