HELP - can't send mail with NTL broadband.

[Macman10]

Hi,

We've just signed up with NTL broadband. We run two Mac laptops off an Airport Extreme wireless base station. Everything works a treat (Internet surfing, receiving email) except that we cannot send emails from the Mac Mail program - it says unable to send every time. We've tried switching everything off, we've been through all the settings (smtp.ntlworld.com as the outgoing server) with the Help Desk, we're not running Password authentication etc....yet nothing works. The Help Desk said it must be a Firewall or Anti-Virus filter that is getting in the way but we're running neither and it still won't send. They suggest calling Apple but we don't want to go down that grotesquely expensive road. Especially since this feels like a small thing that can be fixed with the right know-how.

Any suggestions would be VERY welcome....

Thanks!

 

[Queso]

Make sure you are using NTL's DNS servers in your networking prefs. If you are using any other ISP''s settings (your old ISP's for instance), the IP address smtp.ntlworld.com resolves to will only accept mail coming to @ntlworld.com addresses, since NTL are advertising it on the open Internet. On their internal DNS (the one they hand to their paying clients), the name should resolve to an address that allows outgoing mail to all Internet domains.