Google's Feedback-ID Header

Since we're talking about Google? Does MW pass " Cache-Control: no-cache, max-age=0" on tracking images since the accessing Gmail through the web and mobile interfaces caches the images?
 
@Mxyzptlk FishStix - Google caches all images, regardless from where you access them and regardless of headers. It's been a long discussion about this at that time, but for now we are all fine with the way gmail works.
 
https://blog.movableink.com/real-time-content-and-re-open-tracking-return-to-gmail/

2dce9sg.jpg
 
As the images are served directly from the server(don't go through PHP), you can as well .htaccess them with right expiration.
 
Did the Feedback-ID get added? I tried to add a custom header for it but the colons get stripped out so can't use it

Header Tag / Value
Feedback-ID / [CAMPAIGN_UID]:[SUBSCRIBER_UID]:notify:mymta
 
@Brett - yes feedback id header is added but since that version of mailwizz containing it hasn't been released yet, you'll have to wait a bit more.
 
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