+ better for the environment since they’re much smaller
+ better for mobiles, where email is increasingly being consumed
+ security & privacy
+ faster to load
+ less likely to be classed as spam
+ prints cleanly, saving paper
+ total compatibility
+ exceptional accessibility
+ standardised appearance
+ bandwidth savings for everyone
+ most email clients block images by default anyway
By coincidence, it turns out yesterday was the 151st anniversary of the first successful Pony Express delivery.