Hello and thanks for the information.
There's no need to amend the divorce petition, because you will have the same problems with proof of service. Also, don't use adultery anyway, unless you are absolutely sure that your husband would admit to the adultery, because proving it is very difficult and expensive. If the receipt that you mention has your husband's signature, AND the receipt makes it clear that it's a receipt for the divorce papers, you could use that, to prove to the court that he has received the papers.
Otherwise, you need to get him served personally by a process server, (ie someone who actually hands the papers to your husband) who will then sign a statement of service stating that he served your husband on a given date, and exactly what papers he served on him. The court will accept the process server's statement of service as proof that your husband has received the divorce papers, so then your divorce can go on to the next stage.
The process servers that I use are Stephensons Investigations, and their website is :-
They have contacts all round the world – and if they don't have a contact is UAE, they will probably be able to advise you of someone that does.
I hope this helps and I wish you the best of luck.
Thanks and best wishes...