Remote users can't send

[Roy]

I'va a couple of users who are on the road, they are logging into local isp's and than connecting to our qmail. I've setup relayclients in tcp.smtp file and compiled that but, while thay can get their email they cannot sent mail, any suggestions where i might look...     Roy Kerwood Network Administrator CityXpress.com 604-638-3800 ext 311 604-831-2122