The email client Mozilla Thunderbird comes with the option to import address books from various other email clients like Microsoft Outlook, Eudora or text files. There is however no automatic way to import contact information from a set of emails. Why might that be useful? Imagine having to communicate with a group of users. You could import their contact information into a new address book from emails that you have previously received.
The Email Address Crawler add-on for Thunderbird does that. You can point it at any mail folder in Thunderbird and import the contact information into any address book automatically. The add-on comes with a few filters to make the automatic import more reliable. It is possible to specify if mails should be imported from the To, From or CC fields and if there should be a minimum amount of emails from a person before they are imported.
The add-on will automatically select the most complete email if different versions are available meaning that it will prefer Full Name email@address.org over email@address.org
The add-on provides an excellent way of creating new mailing lists by importing contact information automatically into address books.
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Thunderbird Duplicate Contact Manager
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