import type { Attachment, EmailAddress, EmailMessage } from "../../types.mjs";
/** Inputs used to assemble the MIME document. Kept separate from
*  `EmailMessage` so the builder can be unit-tested in isolation. */
export interface MimeInput {
	from: EmailAddress;
	to: EmailAddress[];
	cc: EmailAddress[];
	bcc: EmailAddress[];
	replyTo: EmailAddress[];
	subject: string;
	text?: string;
	html?: string;
	amp?: string;
	headers?: Record<string, string>;
	attachments?: ReadonlyArray<Attachment>;
	date?: Date;
	messageId?: string;
}
/** Output of `buildMime()` — the serialized RFC 5322 message plus the list
*  of envelope recipients (to/cc/bcc merged) for `RCPT TO`. */
export interface MimeOutput {
	envelope: {
		from: string;
		rcpt: string[];
	};
	body: string;
	headers: Record<string, string>;
}
export declare function normalizeMimeInput(msg: EmailMessage, messageId: string, date?: Date): MimeInput;
export declare function buildMime(input: MimeInput): MimeOutput;
/** Dot-stuff a body for DATA transmission per RFC 5321 §4.5.2. Lines that
*  begin with `.` get an extra `.` prepended so the sequence `\r\n.\r\n`
*  never appears inside the payload. Returns a single string with CRLF
*  line endings. */
export declare function dotStuff(body: string): string;