You told us generically that the email address should be authorized to
post.  Could you be more specific?  Is it because s/he is an owner? A
subscriber?  Specifically, please quote the configuration sections that
control posting.   Look at the person's subscription. Is "nopost" set?

It used to be possible to have multiple subscriptions with different
upper/lower case letters; is this the "case"? ;-)

Finally, consider that Listserv may have different rules for considering
minor differences in email addresses significant than your other systems.
For example, Google ignores dots in a username; Listserv does not.  For
example, we have a FirstClass conferencing system where people think of
their username as first.last, but when it sends mail to the internet, and
Listserv, it uses first_last.   As you've checked this it's ot your problem.

Cheers, Wayne

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