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This extension allows you to replace resource URLs in mailings with alternative versions for use with CDN providers.
This can significantly reduce the load on your CiviCRM server when a mailing is being sent out because the server does not have
to handle the image requests. Various email providers such as Google, Microsoft automatically generate multiple requests
to the server when an email contains images via services such as "Google image cache proxy" etc. and this happens before the email
is opened by the user. This effectively creates a denial-of-service on the sending server if you are sending out large numbers
of mailings.
