/**
 * Extract the pure email address from a potentially formatted address string.
 * Handles formats like:
 *   - "Alice <alice@example.com>" → "alice@example.com"
 *   - "alice@example.com"         → "alice@example.com"
 *   - Malformed "<>" or "<not-email>" → falls back to trimmed raw input
 */
export declare function extractEmailAddress(from: string): string;
/**
 * Check if a sender email is allowed based on whitelist patterns
 * @param from - Sender email address (may include display name)
 * @param allowFrom - Array of whitelist patterns
 * @returns true if sender is allowed
 */
export declare function isAllowedSender(from: string, allowFrom: string[] | undefined): boolean;