yours faithfully、yours sincerely、（尤用于美式英语的）yours truly是信末最常见的敬语,用于正规的及半正规的书信均可.
In English a "yours sincerely" or even a simple "regards" would suffice; French-style floridity survives, just, only in the context of diplomatic correspondence.
正确的格式是在信的开头用Dear Sir/Madam（即不认识收信人）,则信末用yours faithfully,而在信的开头用Dear Mr/Mrs/Miss/Ms Smith（即知其名而不熟悉者）则信末用yours sincerely/truly.
