Under what conditions can a mail carrier refuse to deliver the mail?

If a mail carrier feels that his safety is in danger the least bit, He or She can refuse delivery. This means that if a person has threatened a carrier they can refuse delivery. If a home has a loose dog they can refuse delivery if they feel the dog may bite. If a homes' porch or steps are icy or slippery they can refuse to deliver. If a dog is loose on a street that has all porch mailboxes they can refuse to set foot on the entire street. (i.e. neighbors dog could result in a person not getting mail.) Basically carriers can deliver whenever told by a boss any hour of the day or night and is required by law to deliver every letter until done even if it takes past midnite. They can only not deliver due to extreme illness or a safety issue.