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Implements a mailer preview interceptor that converts image tag src attributes that use inline cid: style URLs to data: style URLs so that they are visible when previewing an HTML email in a web browser.

This interceptor is enabled by default. To disable it, delete it from the ActionMailer::Base.preview_interceptors array:

Included Modules
PATTERN = /src=(?:"cid:[^"]+"|'cid:[^']+')/i