Implications of changing company's SMTP address

[Scott__Hastings]

Using EV/CA/DA 11.01 CHF3

We have CA Seaches setup to seach anything between a Dept and and Outside the Organization. 

If I change the company's SMTP address from comany.com  to companyinc.com will messages that were external become internal and visa versa? Accordoing to this techote the answer is "no."

According to this technote
https://www.veritas.com/support/en_US/article.000045424 

This is what we did:
Add an additional SMTP alias address with the required domain to the Enterprise Vault Journaling Task user in Active Directory, Exchange Administrator, or the Domino LDAP directory. This is the recommended way to add internal domains.

The voulme of review sets decreased by ~ 40% after the SMTP Address change. 

I'm just asking if anyone has any real life experience with this.

Thanks for any guidance!