Please upload the attached file to your admin directory, run it, and then paste the output here (especially if the output it gives is contradictory to what you know your host supports).
For the nervous ones, it's a script that analyzes PHP's and vB's configuration to see if you can support an upcoming project of mine.
edit: It should look similar to this:
Code:
PHP version passed (4.3.1).
MySQL version passed (3.23.49).
imap extension passed.
MySQL connection passed.
MySQL database selection passed.
vBulletin version passed (2.3.0).
MySQL CREATE rights passed (temporary table: "temptable09880319").
MySQL ALTER rights passed.
Congradulations! You appear to support most of the requirements for the vBulletin Mail System.