question that may be more theory at this point

Yes, there are a few ways you can do this.

1. Populate both databases at the point of customer info data entry online.
2. Obtain read access to the specific part of the company database and have a script duplicate the data to your salesperson's database.
3. Run a script that parses incoming emails with customer data and stores it into your salesperson's database.

(1) and (2) require co-operation with the company, and security considerations are a must - such as database access, sensitive data and cross server connections

(3) doesn't require as much co-operation and security consideration, but is probably more difficult to do, because emails aren't structured in their data within the body text.

When you come to do this project, your brief will need to have researched what database software yourself and the company are using, along with tech details (at a minimum). This will allow people you outsource to the ability to understand the system and provide the solution.

You could also consider seeing if the company would fill out a short form instead of sending an email, or perhaps they have an option from their system to export their data as a CSV (comma seperated values) or tab deliminated file.

I may be able to help, but it depends when you're looking to have the work done - I have a few projects lined up already.