E-mail, the bane and boon of communications over the Internet.
See below for a list of direct links regarding how to set up your UC Davis email account from work or home, for both receiving and sending mail.
Accessing your UC Davis Email with a client (Thunderbird, Eudora, Outlook, etc)
Sending E-mail from home through UC Davis
You may not have to do this if you're using your own ISP (smtp.yahoo.com, for example) but if you're traveling with a UC Davis laptop, this is probably your best bet because you can send mail from anywhere, anytime with it.
General UC Davis Email Information