Another potential solution to block 'read receipts' is to turn off image loading by default. Its not ideal - because you don't know what images will load until

Another potential solution to block 'read receipts' is to turn off image loading by default. Its not ideal - because you don't know what images will load until you load them so you may be tempted to load images when you think there may actually be some image content there. The benefit of this approach is that all marketing email won't be tracked as well. disclosure: i'm a co-founder at Streak and we offer read receipts for gmail.