where it is working for your address but not working for others, this is a problem on the SMTP server end refusing to relay the message to some addresses.
a couple things to double check:
- In Universal Email, make sure to set the From address as a valid email for you domain. if you use a dynamic email address for the from address, many hosts will not send the email.
- you may need to check the option to pass the From Address as an extra parameter in the email server settings.
- Double check the SMTP Server name and port you are using, if you are not sure what to use, check with the host.
- If the host offers Pear Mail, you should look into using the Pear Mail for SMTP option in the server settings.