interface MailMessage {
    to: string;
    subject: string;
    body: string;
    html?: string;
}
interface MailDriver {
    send(message: MailMessage): Promise<void>;
}
interface SmtpConfig {
    host: string;
    port: number;
    username?: string;
    password?: string;
    from: string;
    secure: boolean;
}
type SmtpTransport = (config: SmtpConfig, message: MailMessage) => Promise<void>;
declare function resolveSmtpConfig(): SmtpConfig;
declare function assertSafeSmtpField(value: string, field: string): string;
declare function smtpEnvelopeAddress(value: string, field: string): string;
declare function assertSafeSmtpAddress(value: string, field: string): string;
declare function redactMailBody(body: string): string;
declare function defaultSmtpTransport(config: SmtpConfig, message: MailMessage): Promise<void>;
declare function buildSmtpPayload(from: string, message: MailMessage): string;
declare class LogMailDriver implements MailDriver {
    send(message: MailMessage): Promise<void>;
}
declare class SmtpMailDriver implements MailDriver {
    private readonly config;
    private readonly transport;
    constructor(config: SmtpConfig, transport?: SmtpTransport);
    send(message: MailMessage): Promise<void>;
}
declare class Mailer {
    private readonly driver;
    constructor(driver: MailDriver);
    send(message: MailMessage): Promise<void>;
}
declare function createMailDriver(): MailDriver;
declare function mailer(): Mailer;
export type { MailDriver, MailMessage, SmtpConfig, SmtpTransport };
export { assertSafeSmtpAddress, assertSafeSmtpField, buildSmtpPayload, createMailDriver, defaultSmtpTransport, LogMailDriver, Mailer, mailer, redactMailBody, resolveSmtpConfig, SmtpMailDriver, smtpEnvelopeAddress, };