I made an account on the Sandlot website, I got on Minecraft, put in the server ip and tried to jund and it said I wasn't whitelisted! What's the deal with that?
Did you submit a whitelist? If you did you have to wait up to 72 hours for it to be approved. If you didn't fill out a Whitelist.
It could take a few minutes for the whitelist to be accepted, even a few days maybe. When its done, it will notify you be e-mail, and you will be all ready to come online.
Sandlot is a whitelisted server so make sure you filled out this whitelist application: http://www.sandlotminecraft.com/index.php?pages/whitelistapp/ and then wait for your email that says you are able to join. (it's definitely worth it! P.S. Here are c0wg0d's (a server administrator's) awesome videos so you can know how everything works before you even stand in the lobby! http://www.sandlotminecraft.com/index.php?threads/c0wg0d-plays-sandlot-video-tutorials-help.20885/