On 16 Oct 2016, at 18:08, Ruga wrote:

From: "Dianne Skoll <d...@roaringpenguin.com>" <unrela...@spammer.org>


In my servers, the above string is not RFC compliant,

Are you writing your own RFC's? That's cool: the IETF could do with some competition. Where are you publishing them and accepting comments?

The IETF's RFC5322 includes this ABNF ultimately specifying the From header:

   local-part      =   dot-atom / quoted-string / obs-local-part

   domain          =   dot-atom / domain-literal / obs-domain

   domain-literal  =   [CFWS] "[" *([FWS] dtext) [FWS] "]" [CFWS]

   dtext           =   %d33-90 /          ; Printable US-ASCII
                       %d94-126 /         ;  characters not including
                       obs-dtext          ;  "[", "]", or "\"

   qtext           =   %d33 /             ; Printable US-ASCII
                       %d35-91 /          ;  characters not including
                       %d93-126 /         ;  "\" or the quote character
                       obs-qtext

   quoted-pair     =   ("\" (VCHAR / WSP)) / obs-qp

   qcontent        =   qtext / quoted-pair

   quoted-string   =   [CFWS]
                       DQUOTE *([FWS] qcontent) [FWS] DQUOTE
                       [CFWS]

   word            =   atom / quoted-string


   phrase          =   1*word / obs-phrase

   display-name    =   phrase

   angle-addr      =   [CFWS] "<" addr-spec ">" [CFWS] /
                       obs-angle-addr

   name-addr       =   [display-name] angle-addr

   addr-spec       =   local-part "@" domain

   mailbox         =   name-addr / addr-spec

   mailbox-list    =   (mailbox *("," mailbox)) / obs-mbox-list

   from            =   "From:" mailbox-list CRLF

It seems to me that Dianne's example is entirely legal as a From header, essentially because you can put almost anything inside a quoted-string. You'll note that I've left out all the still-legal 'obs-*' component specs because you do not need them in this case. Note that RFC5322 did not expand what is allowed in a From header.

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