Following are a number of back-translations as well as a sample translation for translators of Proverbs 13:17:

• Kupsabiny: “When a unreliable/disobedient person is sent, it brings problems,
  and/but when a gentle/generous/trustworthy person is sent, it brings deliverance to people.” (Source: Kupsabiny Back Translation)
• Newari: “A wicked messenger brings trouble,
  but a good messenger
  brings good health.” (Source: Newari Back Translation)
• Hiligaynon: “A wicked messenger causes-trouble to the people, but a trustworthy messenger makes-good their relationship.” (Source: Hiligaynon Back Translation)
• Kankanaey: “The messenger whose mind/thoughts are evil, he causes-there-to-be problems, but the trustworthy-one, cause-for-happiness is what he gives.” (Source: Kankanaey Back Translation)
• English: “Messengers who are not reliable cause trouble,
  but those who faithfully deliver their messages cause people to act peacefully.” (Source: Translation for Translators)