Yes, it is sure.
The passive form of "Did you reach your home safely?" is "Was your home reached safely by you?" which is very awkward indeed.
we can deliver mail safely by driving safe
Generally the e-mail addresses in Romania have the code .ro, but this is not mandatory (name@ISP provider.ro). We have also addresses with .com, .org, .gov, etc. For Yahoo e-mail: name@yahoo.com
Yes, it is correct to say "Did you reach safely?" to inquire about someone's safe arrival at a destination. However, a more common phrasing might be "Did you arrive safely?"
This depend on your country and the type of the mail.
Ask in a post office in USA.
Approx. one week.
Approx. two weeks.
A ham needs to reach an internal temperature of 145F (63C) to be safely cooked.
Spacesheep is needed to reach Neptune safely.
it can reach about 350 to 500F
In Malayalam, you can say "സുരക്ഷിതമായി എത്തുക" (surakshithamayi etthuka) to convey the meaning of "reach safely".