import { type DraftInput, type EmailAddress } from '@fluxmail/core';
export interface ThreadingHeaders {
    inReplyTo?: string;
    references?: string;
}
/** Build a raw RFC 5322 message from a DraftInput. */
export declare function buildRawMessage(draft: DraftInput, from: EmailAddress, threading?: ThreadingHeaders, replyTo?: EmailAddress): Promise<Buffer>;
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