Emailing forms to outside domains

[BobL]

On my VPS server, whenever I attempt to have an email form send messages to an "outside" domain email address (name@OutsideDomain.com), I get an "internal server error". Works A-OK if I send the same form to an email address at the host domain (name@HostDomain.com). Can't find how/what to do to send email form to outside domain address. Help please.

 

[Dejin]

Please close the custom error logs in setup of the domain and write what kind of error you are having!

 

[BobL]

Issue has been resolved. Mail server was authenticating email addresses and only permitting messages to go to addresses in the host system. Changed script and now working OK.