You can setup a customized post-sale email in Vendor Control Panel > Manage Products > Delivery Options. Check the box Custom Email to see the relevant options.
In both email subject and body, you can use variables from order data by placing special tags in the text. The following tags are available.
{OrderID}, {Currency}, {CreateTime}, {LastUpdateTime}, {TransactionID}, {RefererURL}, {CustomerIP}, {AffiliateID}, {Status}, {Additional1}, {Additional2}, {CouponID}, {CustomerFirstName}, {CustomerLastName}, {CustomerOrganization}, {CustomerAddress}, {CustomerSuburb}, {CustomerZipCode}, {CustomerState}, {CustomerCountryCode}, {CustomerPhone}, {CustomerFax}, {CustomerEmail}, {RecipientFirstName}, {RecipientLastName}, {RecipientOrganization}, {RecipientAddress}, {RecipientSuburb}, {RecipientZipCode}, {RecipientState}, {RecipientCountryCode}, {RecipientPhone}, {RecipientFax}, {RecipientEmail}, {ItemID}, {ProductID}, {ProductName}, {StandardUnitPrice}, {StandardPrice}, {UnitPrice}, {Price}, {Subscription}, {FirstPeriod}, {RegularUnitFee}, {RegularFee}, {RegularPeriod}, {UnitTax}, {Tax}, {TaxID}, {OfferID}, {Quantity}, {UnitCommission}, {Commission}, {Code}, {DownloadLink}, {Total}, {TotalTax}, {TotalCommission}, {Profit}