Looking for Private Message Addon

[Blurg]

Hey guys, I am currently running an addon on trade channel that pms once every 5 minutes that I want to makes people's flasks for free because I am going for elixir master guild achievement.

However, I like to go afk from my computer for a bit so is there any addons that will save any private messages I receive so when I get back to my computer I can find them easily rather than having to syphon through trade chat?

Thanks!!