sendmail to a smarthost?

[Zhang Weiwu]

Hello. In my LAN the DNS server is my ADSL modem ... small device that 
cannot do MX type of address lookup. I wish to configure a fax server 
(FreeBSD 5.2 + Hylafax) in the LAN to send emails to a group of people upon 
receiving fax. The problem is hylafax fax server can only use sendmail to 
send fax notification, but sendmail can send out emails only when it knows 
receipiant's MX ip.

The only way I can think of is to let sendmail send mails by using my ISP's 
smtp server (need login). But I read sendmail(8), I didn't find how to 
configure sendmail to do this, nor did I find such information on the 
handbook. I'm not familiar with sendmail config.

I hope I'm clear:) What should I do now? Do you have something to suggest 
me to read? Thank you.

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