On 10/13/2014 7:47 PM, Joel Rees <joel.rees@gmail.com> wrote: > There is a header for requesting automatic confirmation of delivery, > but it tends to be abused by malicious junkmailers (spammers). MUAs > are supposed to be able to disable it, but I haven't seen that option > in an MUA settings dialog for a long time. You mean like Thunderbird has in: Tools > Account Settings > Return Receipts ?