Headers: {
    [key: string]: string | string[] | {
        prepared: boolean;
        value: string;
} | {
    key: string;
    value: string;

Represents an object or array of additional header fields. Prepared header values that are not folded or encoded by Nodemailer. This type is compatible with Headers of nodemailer. This API is experimental and might change in newer versions. Use with caution.

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