Just read this, in the preview of Noah Lukeman's The First Five Pages: A Writers Guide to Staying Out of the Rejection Pile:
Most honorable Sir,
We perused your MS.
with boundless delight. And
we hurry to sear by our ancestors
we have never read any other
that equals its mastery.
Were we to publish your work,
we could never presume again on
our public and name
to print books of a standard
not up to yours.
For we cannot imagine
that the next ten thousand years
will offer its ectype.
We must therefor refuse
your work that shines as it were in the sky
and beg you a thousand times
to pardon our fault
which impairs but our own officers.
It's signed with a simple unidentified "Publishers", which seems perfectly suited in response to Louis Zukofsky's "A".