On Mon, 06 May 2013 11:20:42 -0400, "Barry D. Krawchuk" said:

> It does look like Google changed a policy. As far as we can tell from our
> old mail, we've been sending two forms of the sender's email address since
> May 2010.

Note that the fact you got away with it since 2010 doesn't mean it hasn't
been against the letter of the RFC's all the way back to RFC822 in 1982.

Sender: has *always* been required with multiple From: values - rfc822 says:

     4.4.1.  FROM / RESENT-FROM

        This field contains the identity of the person(s)  who  wished
        this  message to be sent.  The message-creation process should
        default this field  to  be  a  single,  authenticated  machine
        address,  indicating  the  AGENT  (person,  system or process)
        entering the message.  If this is not done, the "Sender" field
        MUST  be  present.  If the "From" field IS defaulted this way,
        the "Sender" field is  optional  and  is  redundant  with  the
        "From"  field.   In  all  cases, addresses in the "From" field
        must be machine-usable (addr-specs) and may not contain  named
        lists (groups).

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