Sorry to spam the list for this, but I was not able to find anything close to a technical
support email contact on
their web page...
To avoid many round trip mails, here's the problem:
we get incoming mails with senders like <+4176...(a)mms.sunrise.ch>ch>.
mms.sunrise.ch. 3600 IN MX 10 mm3.sunrise.ch.
Host mm3.sunrise.ch not found: 3(NXDOMAIN)
So, those sender addresses are invalid, and get rejected on our mail servers. Might want
to fix your DNS..
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