Question/Topic: How to verify email addresses?
On the 
Advanced menu, click 
Maintenance.
In the 
Database Maintenance window click 
Verify Email Addresses.
Select a field in the 
Email Field to Verify box. (this field will be verified).
If you want to display (filter) records with valid email addresses click on 
Display Valid eMail Addresses button. 
If you want to display (filter) records with invalid email addresses click on 
Display Invalid eMail Addresses button. 
Display Valid or Invalid eMail Addresses feature filters records.
If you want to display all your email list records afterwards right click on the small 
Filter Button at the top of the left panel (which says 
Normal Filter) and select 
All Records.