On Apr 7, 2014, at 5:26 PM, John Levine <[email protected]> wrote:

>> Except, if the receiver MTA does not find a domain in the From: it may 
>> reject the message or consider it SPAM by
>> default� because it is a know workaround DMARC, and this format is not RFC 
>> compliant (even in IEA mode it is
>> discouraged).
> 
> My headers are fully RFC 2822 and 5322 compliant.  If people insist on
> breaking their MTAs so they lose perfectly valid mail aent from IPs
> with squeaky clean reputations, there's not much I can do about it.
> 
http://tools.ietf.org/html/rfc5322#section-3.6.2
from            =   "From:" mailbox-list CRLF
mailbox-list    =   (mailbox *("," mailbox)) / obs-mbox-list
mailbox         =   name-addr / addr-spec
name-addr       =   [display-name] angle-addr

angle-addr      =   [CFWS] "<" addr-spec ">" [CFWS] /
                       obs-angle-addr
addr-spec       =   local-part "@" domain
So the From: must contain at least one domain...

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