using sendmail - cpanel machines wont accept

[samsofweb]

Hello

i am sending mail via sendmail from a unix box to machines with cpanel on them and it wont work.

i can send mail fine to any box that doesnt use cpanel

when i use outlook to send to a machine with cpanel on this is fine.

so basically it seems that for some reason, cpanel in some way is stopping my mails being sent because i use sendmail on another machine.

has anyone seen this error before -is it a common thing?

[taivu]

What is the error message you are getting (in exim_mainlog, I assume)??