How do you exchange big files?

[raz_atoth]

It's called a pbem game and not without reason. However the file sizes tend to be quite big if you aren't playing on just tiny/small maps.I have a game going where only the setup file was worth about 14MB.I imagine once the real action starts the size of the pbem file will dramatically increase.Thus,it won't be feasible anymore to sent it through mail.Not to mention most email servers place limitations on the size of the attachment.
What are you guys using?Are there better options for file transfers other than mail?