I recently sent an encrypted message via sigaint e-mail service, and before submitting it, I noticed there was an option for getting a receipt when the e-mail is read and when it is delivered. Naturally, I checked both boxes. I sent this e-mail approximately 12 hours ago, and I have yet to receive a receipt telling me the e-mail was even delivered. Is this an issue for which I should consider resending? Thanks ahead of time for the help.
Some mail services (the more "anonymous" ones for example) don't issue receipts of any sort, so it may or may not work. I believe if your sending to another sigaint address, it wont issue them...but I'm not 100% on that.
It's an iffy thing, and there are certain mail clients as well that you can turn that off and not issue a mail receipt as well.