Date: 1829
From: Rabbi Moshe Sofer
To: Rabbi Meir
Rabbi Meir asked about the Maharal of Prague's objection to reciting the Selichos piyyut Machnisei Rachamim, which petitions angels as intermediaries. The Chasam Sofer defends the Maharal's distinction and reveals he personally avoids this piyyut.
Source: Shu"t Chasam Sofer OC §166