I'm looking for Interspire with following add-ons:
1. Multiple SMTP/MTA Option As Per User
2. Multiple Subject rotation.
3. Multiple Signature rotation.
4. Multiple From rotation.
5. Feedback Loop processing
6. Export System
7. Multi Thread
8. SPIN addon (so that interspire domain doesn't go out in emails)
9. Click and Open Tracking
10. Bounce processing