As for "it must be a distinguished guest in a foreign land", it is a purely catering word, but it is not necessarily true, because the post horse will have different reactions when it meets different combinations in the life palace:
If the post horse meets sudra, it will "run", indicating that it is unfavorable to go out.
If the post horse meets Lu Cun or, it is a "friendship between Lu and Ma" and is suitable for going out for business.
Generally speaking, Houma's life should be coordinated as a whole to see if it is conducive to going out.