We've had reports that some Yahoo! Groups members with Hotmail and MSN
mail accounts have been bouncing since approximately December 29,
2006. The error message many of you are reporting is "550 Command
rejected for policy reasons."
We are working with our contacts on the Hotmail team to understand why
this occurred and will let you know when the problem has been
resolved. We appreciate your patience and we apologize for the
inconvenience this has caused.
We also want to acknowledge an outage the U.S. and International
Groups sites experienced early today (Pacific time). Users who
attempted to access their groups on the Web experienced timeouts on
their browsers between the hours of 12:45 a.m. and 2:15 a.m. Pacific.
This issue has been resolved and we are investigating solutions to
prevent similar outages in the future.