Is it okay for married men/women to have friends of the opposite sex?

Do you find it appropriate for married men/women to have friends of the opposite sex? If you are JUST friends. Have friendly conversations nothing more than that. Have no feelings or needs beyond friendship. Say you were friends before your SO came into the picture. What about if this friend lived long distance? Is it unreasonable to message as long as your SO can read it anytime? What are your views?

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