The sample XIT7MAIL package approver exit has three options for modifying the 'FROM' email address. If option 2 - Use the PECBUSER filed, is selected, the domain name is not appended to the user id. The results in the 'FROM: [email protected]' , rather then 'FROM: [email protected]'
The is a know problem #7336. Contact support for resolution. Test apars are available.