If you are receiving an error message that states your pending
messages are temporarily unavailable it may be caused by the size of
an attachment to the messages which are showing as unavailable. As
you may know, we recently increased the size of messages that can be
emailed from 1MB to 15MB:
We have discovered a bug in the moderation system that causes
messages that are bigger than 5MB to be unavailable when you try to
view, approve, edit, or reject them.
For the moment, all you can do is delete these messages and then ask
the user to repost them after first taking the user off moderation
(even if it's only long enough to send this one message) or by
asking them to repost the message as one or more messages with no
attachments bigger than 5MB in any given message.
We apologize for the inconvenience. Unfortunately, we most likely
won't have a fix for this bug for some time (until we complete the
refactoring of the moderation pages).
Yahoo! Groups Team