A mashup gathers useful information from various sources and presents it in a meaningful way. The IBM Mashup Center is one of the most widely used mashup editors. Data comes from different sources in various formats and the mashup editor combines them together and gives the output in a different format. The IBM Mashup Center currently supports feed generation from various sources like Excel files, Access files, database files, CSV files, etc. Currently, however, it does not support feed generation from a mail server. Thus, we have implemented a mail plugin that adds this feature to the mashup center. The mail plugin fetches the mail using the POP3/IMAP protocol and converts it into ATOM feeds. The mail plugin uses a Java mail API for connecting to and accessing the mail server. The generated feed gets a unique URL which can be used by widgets to access the feed. It supports the dynamic addition of new mail servers to its trust store. Security is further enhanced by providing a digital signature feature that is in enveloped form, i.e. it goes with the feed as one of its elements. The digital signature is checked at the receiver side to assure data integrity.