Last week it was Xtra blocking outbound mail at reception.
This week any message having a Xtra or Yahoo address in the From header is
being rejected upon receipt from our listserver, despite the listserver
using its own address in the envelope & in the Sender header.
When I follow the URL in the quoted SMTP responses, it turns out that Yahoo
think I should change my listserver so that the senders address does not
appear in the From header. Which sucks, because we already put the
listserver's own address in the Sender header (which most mail clients will
then render as "From knitting circle on behalf of Jane Smith"), and as far
as I know, we're following the RFCs to the letter.
So have I missed something in the RFCs that permits Yahoo to do this?
They're essentially saying "we don't permit our subscribers to subscribe to
mailing lists unless the mailing list is deliberately broken".
-Martin
