Mail Account - You can create mail accounts from which you want to extract email ids.

File Management - You can create list of extracted unique email ids from your mail account.

You can recursively extract email ids from remote sites, from local html files as well as from your online subscription manager.

You can merge contact lists to create list of unique email ids.

This increases the performance of your contact list.

Email Spider has built-in Email Verifier and Validator.

You can create your contact list by checking the validity of email ids without sending emails to those email ids.