@lgriffin/esi.ts - EVE Online ESI API Client - v12.3.0
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    Variable MailHeaderSchemaConst

    MailHeaderSchema: ZodObject<
        {
            mail_id: ZodOptional<ZodNumber>;
            subject: ZodOptional<ZodString>;
            from: ZodOptional<ZodNumber>;
            timestamp: ZodOptional<ZodString>;
            labels: ZodOptional<ZodArray<ZodNumber>>;
            is_read: ZodOptional<ZodBoolean>;
            recipients: ZodOptional<
                ZodArray<
                    ZodObject<
                        {
                            recipient_id: ZodNumber;
                            recipient_type: ZodType<
                                | string & {}
                                | "character"
                                | "corporation"
                                | "alliance"
                                | "mailing_list",
                                unknown,
                                $ZodTypeInternals<
                                    | string & {}
                                    | "character"
                                    | "corporation"
                                    | "alliance"
                                    | "mailing_list",
                                    unknown,
                                >,
                            >;
                        },
                        $loose,
                    >,
                >,
            >;
        },
        $loose,
    > = ...

    One inbox summary, from GET /characters/{character_id}/mail. Carries the mail_id and the is_read flag; the body is only on the single message.