I'm trying to use an email signature that has a “rotating” logo.
Each month the logo changes (like Google's “doodle”, kind of).
Instead of changing the signature of my colleagues every month, I'd rather use an image that points to a web URL, and the signature changes automagically without users' concern.
And it works, but only sometimes.
The question is why it doesn't always reflect the image on the server? And how to force using linked images in the signature?
At other times, a colleague's signature's image just remains indefinitely, while other's signature's image reflects the image on the server.
- I'm changing the signature via Gmails' web interface → Settings.
- I test the signature on new emails (already-opened emails' images are preloaded by Google to circumvent tracking, so just reloading the same email doesn't reflect reality).
- Me and my colleagues all share the same domain (our emails are firstname.lastname@example.org).