Sierra Wireless Modem Integration -- 3

I need to integrate a new Sierra Wireless modem into my existing system, which currently operates with an older Sierra module. When we use the new module the SMS is working but EMAIL is not.

Current module and modem that's working. SMS and Email both working.
VST 277 with HL7650

New Module and modem only SMS working
VST 278 with RC7620-1

Requirements include:
- Firmware integration using CODEVISION compiler
- Basic functionality check post-integration

Ideal Skills and Experience:
- Experience with Sierra Wireless products
- Proficient in firmware integration and CODEVISION
- Familiarity with testing and validation processes