/**
 * Per-account outbound attachment limit resolution.
 *
 * The goal is to catch "this provider will bounce it" before the SMTP
 * transaction, so the effective limit is the strictest of the global setting
 * and the provider's documented cap — unless the account sets its own
 * explicit limit, which always wins (the escape hatch for providers that
 * raise limits or self-hosted relays).
 */
/** Fallback cap (MB, base64-encoded total) when nothing more specific is known. */
export declare const DEFAULT_SEND_LIMIT_MB = 25;
export interface SendLimitAccount {
    email: string;
    smtp: {
        host: string;
    };
    /** Optional explicit per-account cap from `max_attachment_mb`. */
    maxAttachmentMb?: number;
}
/** Resolve the effective attachment cap (MB) for one account. */
export declare function resolveSendLimitMb(account: SendLimitAccount, globalMb: number): number;
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