If you place the date and address after the signature, put it at the left of the sheet; thus—
I remain, my dear Madam,
With much respect,
Yours sincerely,
S. E. Law.
Mrs. E. C. Howell.
June 27th, 1859.
For a long letter, it is better to put the date and address at the top of the page. For a letter of only a few lines, which ends on the first page, the second form is best. In a letter written to a person in the same city, you need not put the address under the signature; if not, write it—
S. E. Law,
Willow Grove, New York.
In writing to a dear friend or relative, where there is no formality required, you may omit the name at the top of the letter; put the date and address thus—
Willow Grove, New York,
June 27th, 1859.
Dear Anna:
I write, etc.
It is best, however, to put the full name at the bottom of the last page, in case the letter is mislaid without the envelope; thus—