Your Internet Provider does not provide
SMTP servers?
Your ISP does not provide
SMTP (outgoing mail) servers?
1. Some ISP's
do not provide SMTP services 'at all' - expecting
you to use webmail when most people would prefer
to use a normal email program like Outlook / Outlook
Express.
2. Even when
they do provide SMTP servers they may be unreliable
/ overloaded.
3. AuthSMTP
works with almost all email programs and ISP's.