export declare function generateUnsubscribeToken(email: string, jwtSecret: string): string;
export declare function generateUnsubscribeUrl(email: string, jwtSecret: string, serverUrl: string): string;
export declare function injectUnsubscribeFooter(htmlBody: string, unsubscribeUrl: string): string;
export declare function getUnsubscribeHeaders(unsubscribeUrl: string): Record<string, string>;
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