have you ticked the box's for certify mail? the box's should be
check incoming mail = ticked
check outgoing mail = ticked
certify mail = ticked
with attachments = unticked
you can then go to details and change/add to the message.
hope this helps
AMD Radeon Adrenalin release date, new features, compatible graphics cards
Indie publisher Canongate’s top 10 book covers of 2017
New iMac Pro release date, UK price & specs rumours
Tablettes Amazon Fire : quel modèle choisir ?