Label gen failing for Ship by Loop merchants using USPS Ship

We are seeing an increase in label failures for SBL merchants using Loop's negotiated USPS rates post migration to USPS Ship. We have identified a fix and working on both a short term resolution and long term fix with EasyPost. The error message in the timeline will be a bit cryptic and look something like this. Additional update in 5 minutes.

"An error occurred: Purchasing the shipping label failed — EasyPost: /labels/v3/: code=400, message=OASValidation OpenAPI-Spec-Validation-Labels with resource oas://labels-v3.yaml: failed with reason: [ERROR - [Path '/senderAddress'] Instance failed to match all required schemas (matched only 2 out of 3): __/properties/senderAddress/allOf/0: Instance failed to match all required schemas (matched only 2 out of 3)__ERROR - [Path '/senderAddress'] Instance failed to match all required schemas (matched only 2 out of 3): [/properties/senderAddress/allOf/0/allOf/2: String __referral_customer_6ffe2bef032046e1926c76dde09b3119@donotemail.easypost.com__ is too long (length: 74, maximum allowed: 50)]ERROR - [Path '/senderAddress/email'] String __referral_customer_6ffe2bef032046e1926c76dde09b3119@donotemail.easypost.com__ is too long (length: 74, maximum allowed: 50): []]"