How to prevent missing images in the body of the letter?

Question

Email

Hello.
I am creating a letter with attached images on the site. The image tag looks like this:

<img src='http:/site.com/image.php?mediaID=ODAwNTE2ODNiMDAzZWE=&type=thumb&folderID=ODE1MTY4M2IwMDNlYQ==&size=45' style='vertical-align: middle' />

In letters received on mail.yandex.ru, the image is displayed normally, but images are not displayed on mail.google.com.
Tell me, please, how to fix this?

Answer 1

GMail doesn't always show external images, and especially doesn't like emails with dynamic images (because the image can be changed). You can either try to make the image address look like a static one, which still does not guarantee the result, or use the multipart / related part for HTML with inline images

Content-Type: multipart/related; boundary="123"

--123
Content-Type: text/html ...
Content-ID: ...
Content-Disposition: inline
...
--123
Content-Type: image/jpeg ...
Content-ID: <[email protected]>
Content-Disposition: inline
...
--123
Content-Type: image/jpeg ...
Content-ID: ...
Content-Disposition: inline
...
--123-

-
picture include as
<img src="cid:[email protected]">

Answer 2

images are not displayed

Protection from external links. Use the embedded image.