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Is it possible to redirect HTTP images used in email clients?

I saw the answers to This is normal for HTTP image redirection . These are YES browsers will be redirected.

However, do email clients (GMail, Express, Thunderbird, Yahoo ...) follow the same rule?

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I just answered this superuser . Here is the same answer:

Yes. I just sent an email containing <img src="http://www.example.com/img/logo.png" alt="not displayed"/>. An example server is under my control when redirecting to the same URL using https.

My findings:

  • GMail 24 Oct 2017: , - https://ci3.googleusercontent.com/proxy/2ks...5hk=s0-d-e1-ft#http://www.example.com/img/logo.png. , , - .
  • Thunderbird 52.4.0: , .
  • 3.18.5.2: , Thunderbird. Ctrl + I, .
  • Outlook ( ): , Windows-.
  • Mail macOS (10.3): , , . , , .
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Source: https://habr.com/ru/post/1611545/

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