A mail inserter for inserting a mail into an envelope having a flap and a throat, including: an envelope entry; an envelope carrier, provided downstream of the envelope entry; an envelope retainer, provided at the downstream of the envelope carrier; a mail entry, for advancing the mail into the mail inserter; a mail carrier, provided downstream of the mail entry; a sealer, provided downstream of the envelope retainer; wherein the envelope entry, envelope carrier, envelope retainer and sealer jointly form an envelope path, and the mail entry and the mail carrier jointly form a mail path that merges into the envelope path after the mail carrier.