Thread:Project:Support desk/Restricting email address users can use/reply (3)

Yes, "||" means "or".

In the part you quoted, you can remove the check against "example.com". example.com is a domain,which is reserved for examples. It can only be used in examples; you can be sure that no one will have it in real life. For $message you need to amend the different parts of the string together. Like so: