Is it permissible for a woman who is not a relative to prepare iftar for young men living abroad?

There is no objection to accepting iftar from a non-mahram woman, and she will be rewarded for it, as the Prophet, peace and blessings be upon him, said: "Whoever provides food for a fasting person to break his fast, he will have a reward like theirs, without that detracting anything from the reward of the fasting person."

It is forbidden to be in seclusion with her or to shake her hand. Conversation with her must be limited to what is necessary, without excessive familiarity. And she should be thanked, as the Prophet, peace and blessings be upon him, said: "Whoever does not thank people does not thank Allah."