Ex-USPS here.

That is against the law. Once the service is paid for (mailer-full coverage), it has to be delivered, period. If any post offices still had undelivered political mail, after the election, it would have to be delivered, by law, unless they added some type of post-election stipulation.

Also, any and all mail, that you have for the day, has to be delivered by the end of the day. There's no such thing as, 'save it till tomorrow', unless that has also changed, or it has been approved on a single basis, from higher-ups. Sometimes when there's a ton of DPS(letters) and flats(magazine/size) and packages they would tell us deliver all packages and bring everything else back. This rarely happened and was usually after holidays when there would be an extremely high amount of DPS/packages and it was getting late.

Supervisors report to the Post master, so ultimately, the PM could be the one calling the shots, in this case. It could also be coming from the district head.

Edit - One more thing to demonstrate how serious USPS is about delivering everything coming through, per day, every day - We would sometimes get letters that were so shredded that there was literally only a couple inches left of the entire letter. If there was enough left of a destroyed letter, to read the address, we'd have to deliver it, even if there wasn't anything legible/left of what was inside. I've actually had to deliver just the address part of an letter. Everything else was destroyed.

Ex-USPS here.

That is against the law. Once the service is paid for (mailer-full coverage), it has to be delivered, period. If any post offices still had undelivered political mail, after the election, it would have to be delivered, by law, unless they added some type of post-election stipulation.

Also, any and all mail, that you have for the day, has to be delivered by the end of the day. There's no such thing as, 'save it till tomorrow', unless that has also changed, or it has been approved on a single basis, from higher-ups. Sometimes when there's a ton of DPS(letters) and flats(magazine/size) and packages they would tell us deliver all packages and bring everything else back. This rarely happened and was usually after holidays when there would be an extremely high amount of DPS/packages and it was getting late.

Supervisors report to the Post master, so ultimately, the PM could be the one calling the shots, in this case. It could also be coming from the district head.

Edit - One more thing to demonstrate how serious USPS is about delivering everything coming through, per day, every day - We would sometimes get letters that were so shredded that there was literally only a couple inches left of the entire letter. If there was enough left of a destroyed letter to read the address, we'd have to deliver it, even if there wasn't anything legible/left of what was inside. I've actually had to deliver just the address part of an letter. Everything else was destroyed.

Ex-USPS here.

That is against the law. Once the service is paid for (mailer-full coverage), it has to be delivered, period. If any post offices still had undelivered political mail, after the election, it would have to be delivered, by law, unless they added some type of post-election stipulation.

Also, any and all mail, that you have for the day, has to be delivered by the end of the day. There's no such thing as, 'save it till tomorrow', unless that has also changed, or it has been approved on a single basis, from higher-ups. Sometimes when there's a ton of DPS(letters) and flats(magazine/size) and packages they would tell us deliver all packages and bring everything else back. This rarely happened and was usually after holidays when there would be an extremely high amount of DPS/packages and it was getting late.

Supervisors report to the Post master, so ultimately, the PM could be the one calling the shots, in this case. It could also be coming from the district head.