www.wysiwygwebbuilder.com

Please have a look here : http://communitylifestyleaccommodation. ... tform2.php
I used the Form Wizard, used the same sever details as in Outlook (which works fine)
Then, I changed from Port 587 to 25, but still get error 500 and email is not beeing sent

Whay

Are you sure these are the correct settings?
The server used in outlook may not be accessible from the webhost.

Note that this can only be a configuration issue.
So, only your web host can tell you the correct settings.

Thanks

It ended up being due to change in SMTP setting rules of the host provider

Thanks again