Monsieur, Madame and Mademoiselle used, best not to abbreviate. Use Mr. or Ms. at all times - Mr. Miss Best not to abbreviate. Family name is sometimes capitalized with given name following. To Herr, on separate line.
Business is formal.
Do not use given names unless invited. Use academic titles precisely. English is a common business language. Given names are used only by family and close friends. Israel Ephraim Ben-Aharon International Publishers Ltd. 25, Druyanov Street 63143 TEL AVIV English company names are common.