Changes to Send an email

the bcc/items request property's maxLength was set to 320

the cc/items request property's maxLength was set to 320

the from request property's maxLength was set to 998

the reply_to request property's maxLength was set to 320

the to/items request property's maxLength was set to 320

the scheduled_at request property type changed from string to no type, and format from date-time to no format

added subschema #1 subschema #2 to the scheduled_at request property anyOf list

removed the pattern ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ from the request property scheduled_at

added the new daily_limit_exceeded enum value to the anyOf[#/components/schemas/Error]/code response property for the response status 403

added the new daily_limit_exceeded enum value to the code response property for the response status 400

added the new daily_limit_exceeded enum value to the code response property for the response status 401

added the new daily_limit_exceeded enum value to the code response property for the response status 404

added the new daily_limit_exceeded enum value to the code response property for the response status 422

added the new daily_limit_exceeded enum value to the code response property for the response status 429

added the new monthly_limit_exceeded enum value to the anyOf[#/components/schemas/Error]/code response property for the response status 403

added the new monthly_limit_exceeded enum value to the code response property for the response status 400

added the new monthly_limit_exceeded enum value to the code response property for the response status 401

added the new monthly_limit_exceeded enum value to the code response property for the response status 404

added the new monthly_limit_exceeded enum value to the code response property for the response status 422

added the new monthly_limit_exceeded enum value to the code response property for the response status 429

added the new send_limit_exceeded enum value to the anyOf[#/components/schemas/Error]/code response property for the response status 403

added the new send_limit_exceeded enum value to the code response property for the response status 400

added the new send_limit_exceeded enum value to the code response property for the response status 401

added the new send_limit_exceeded enum value to the code response property for the response status 404

added the new send_limit_exceeded enum value to the code response property for the response status 422

added the new send_limit_exceeded enum value to the code response property for the response status 429

the to request property's minItems was increased to 1

the attachments/items/content request property's minLength was increased from 0 to 1

the attachments/items/filename request property's minLength was increased from 0 to 1

the from request property's minLength was increased from 0 to 1

the subject request property's minLength was increased from 0 to 1

added the pattern ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ to the request property scheduled_at

removed the success response with the status 200

the attachments/items/content request property's maxLength was set to 25000000

the headers/additionalProperties request property's maxLength was set to 1024

the idempotency_key request property's maxLength was set to 64

the subject request property's maxLength was set to 998

the tags/items request property's maxLength was set to 64

added the new optional header request parameter Idempotency-Key

added the new optional request property attachments/items/content_id

added the new optional request property idempotency_window_hours

added the new optional request property signature

added the new optional request property tracking

added the new optional request property unsubscribe

added the non-success response with the status 403

added the non-success response with the status 404

added the non-success response with the status 422

removed the non-success response with the status 402

added the optional property code to the response with the 400 status

added the optional property code to the response with the 401 status

added the optional property code to the response with the 429 status

added the success response with the status 202