Synchronizing Gmail Aliases

Synchronizing Gmail Aliases

Greetings, 

One of our users has a primary gmail account synched to Zoho CRM, but with several gmail aliases associated with this account. These are 'true' aliases, and not those using the '+' symbol. 

How can we add these aliases in her emails settings so that they will be recognized and the messages sent to, and received from, Contacts and Leads imported to our Contact and Lead records?

Thanks!