Lisa wrote:
Hi,

I set up for all messages I send, request Reading/Delivery receipt. However
it only works for internal receiver, not work for external receiver like
Yahoo mail. Please advice!

Thanks in advice!

Lisa

Not all e-mail servers/providers/clients support this feature. Even if
it does, the recipient likely has the option to not send a read/delivery
receipt. There is nothing you can do about it.

Tim