Postpet Handbook
Chapter 1: Email Settings
1.1 Web mail
Postpet DOES NOT work with web mail. Common web mail such as
HotMail and Yahoo Mail cannot be used as postpet email addresses. You need to have a POP3 email account for Postpet. You can either use the one provided by your ISP or apply for a free POP email online.
1.2 Free POP3 email
Here are a few free POP3 email providers:
SoftHome
HotPop
Geocities
Nettaxi
forfree.at
Usa.net
1.3 Setting up the software
Here is the email setting for some of the free POP3 email accounts:

Your email: @

SMTP:
POP:

For others, please refer to
Help on General Network Settings from the official homepage.