BuiltWith returns all the technologies in use that it can from the domain name of the email.
Works with:
Find out what technologies the website is using with BuiltWith. 

BuiltWith technology tracking includes widgets, analytics, frameworks, content management systems, advertisers, content delivery networks, web standards and web servers.
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BuiltWith will ask for the permissions shown below. Learn more
BuiltWith will need access to your Google account
This will allow BuiltWith to :
View your email message metadata when the add-on is running
Run as a Gmail add-on
Connect to an external service
See your primary Google Account email address
See your personal info, including any personal info you've made publicly available
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