Centralized SMTP client

I have a requirement of sending mail using SMTP. But the to Mail ID's will be retrieved from database, based on the given category(success/error).Then only I am able to send the mail. The above requirement needs to be implemented in the following application types

1. Winforms


2. SSIS packages


3. asp.net MVC


4. Classic ASP

So I thought of creating a webservice, which can be consumed in all the above applications.

Is there any other way to implement this requirement??