> I have a problem when posting. The thing is that every time I post to
> the mailing list, I get an error saying that the message could not be
> delivered but it does indeed.
It's getting delivered to the list OK but one of the subscribers to the list
is rejecting it. I've seen this a fair bit from MySQL lists and it can be
for a number of reasons - eg. people's Hotmail accounts filling up or a
mail server's automated rules rejecting it for one reason or another.
I wouldn't worry about it.