/**
 * Check if a string looks like an email channel target
 * @param target - Target string to check
 * @returns true if target has mail: or email: prefix
 */
export declare function looksLikeEmailTarget(target: string): boolean;
/**
 * Parse email address from email channel target
 * @param target - Target string with mail: or email: prefix
 * @returns Parsed email address
 * @throws Error if target doesn't have valid prefix
 */
export declare function parseEmailTarget(target: string): string;
/**
 * Normalize email target to lowercase without prefix
 * @param target - Target with or without prefix
 * @returns Normalized email address
 */
export declare function normalizeEmailTarget(target: string): string;
/**
 * Format email address as email channel target
 * @param email - Email address (with or without prefix)
 * @returns Formatted target with mail: prefix
 */
export declare function formatEmailTarget(email: string): string;