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diff --git a/src/errors.rb b/src/errors.rb
index a930a71..3607b85 100644
--- a/src/errors.rb
+++ b/src/errors.rb
@@ -2,3 +2,19 @@
 # databases might eventually use.
 class DatabaseError < StandardError
 end
+
+
+# Perhaps surprisingly, used to indicate that an account name is
+# invalid.
+class InvalidAccountError < StandardError
+end
+
+
+# Used to indicate that an account does not exist on the filesystem.
+class NonexistentAccountError < StandardError
+end
+
+
+# Used to indicate that a domain does not exist on the filesystem.
+class NonexistentDomainError < StandardError
+end