Within ShipHero you are able to mail letters via First Class Mail using Standard Postage (Endicia accounts only). Follow these steps:
- Ensure you have a USPS (Endicia) account connected to ShipHero.
- Check that the box size USPS Letter is active under Shipping > Boxes as shown in the image below.
- Ensure that you are using the USPS Letter box size that is mapped to USPS. Do not create your own custom box size for this shipping service.
If you know that you are going to be shipping certain orders using this service, you can either map the methods under mapping or set an automation rule so the box size and service are filled in for you when shipping occurs.