diff --git a/lib/message/mu-message.cc b/lib/message/mu-message.cc
index ee692b4e..46063cfe 100644
--- a/lib/message/mu-message.cc
+++ b/lib/message/mu-message.cc
@@ -563,9 +563,7 @@ process_message(const MimeMessage& mime_msg, const std::string& path,
 	if (info.body_txt) { /* attempt to get the body-language */
 		if (const auto lang{detect_language(info.body_txt.value())}; lang) {
 			info.language = lang->code;
-			mu_debug("detected language: {}", lang->code);
-		} else
-			mu_debug("could not detect language");
+		}
 	}
 #endif /*HAVE_CLD2*/
 }
diff --git a/lib/mu-contacts-cache.cc b/lib/mu-contacts-cache.cc
index b9b9b50f..eaa5b1fa 100644
--- a/lib/mu-contacts-cache.cc
+++ b/lib/mu-contacts-cache.cc
@@ -194,10 +194,11 @@ ContactsCache::serialize() const
 void
 ContactsCache::add(Contact&& contact)
 {
-	/* we do _not_ cache invalid email addresses, so we won't offer them in completions etc. It
-	 * should be _rare_, but we've seen cases ( broken local messages) */
+	/* we do _not_ cache invalid email addresses, so we won't offer them in
+	 * completions etc. It should be _rare_, but we've seen cases ( broken
+	 * local messages, and various "fake" messages RSS2Imap etc. */
 	if (!is_valid(contact.email)) {
-		mu_warning("not caching invalid e-mail address '{}'", contact.email);
+		mu_debug("not caching invalid e-mail address '{}'", contact.email);
 		return;
 	}
 
diff --git a/lib/mu-maildir.cc b/lib/mu-maildir.cc
index 5166b17e..5eef69e5 100644
--- a/lib/mu-maildir.cc
+++ b/lib/mu-maildir.cc
@@ -264,8 +264,6 @@ msg_move_verify(const std::string& src, const std::string& dst)
 		mu_debug("source is still there ({}->{})", src, dst);
 	}
 
-	mu_debug("moved {} -> {}", src, dst);
-
 	return Ok();
 }
 /* LCOV_EXCL_STOP*/
@@ -430,7 +428,6 @@ Mu::maildir_determine_target(const std::string&	old_path,
 	if (const auto checked{check_determine_target_params(
 		old_path, root_maildir_path, target_maildir, newflags)}; !checked)
 		return Err(Error{std::move(checked.error())});
-
 	/*
 	 * this gets us the source maildir filesystem path, the directory
 	 * in which new/ & cur/ lives, and the source file