Mail.Google.Com-Mail-Help-Images-LogoOne of the little-known freebies Gmail offers is a portable SMTP server to send mail from any network for any email address. Travellers who use their ISP’s SMTP server to send mail with their email program (like Thunderbird or Outlook Express) can find themselves in a bind if they’re on another network away from home, like at a coffee shop, airport or visiting relatives. Link.