diff -r b5fb268b7f04 roundup/anypy/ssl_.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/roundup/anypy/ssl_.py	Tue Jan 04 17:56:48 2022 -0500
@@ -0,0 +1,6 @@
+try:
+    # Python 3+
+    from ssl import SSLError
+except (ImportError, AttributeError):
+    # Python 2.5-2.7
+    from socket import sslerror as SSLError
diff -r b5fb268b7f04 roundup/mailgw.py
--- a/roundup/mailgw.py	Tue Jan 04 16:31:04 2022 -0500
+++ b/roundup/mailgw.py	Tue Jan 04 17:56:48 2022 -0500
@@ -112,6 +112,7 @@
 from roundup.hyperdb import iter_roles
 from roundup.anypy.strings import StringIO, b2s, u2s
 import roundup.anypy.random_ as random_
+import roundup.anypy.ssl_ as ssl_
 
 try:
     import gpg, gpg.core, gpg.constants, gpg.constants.sigsum
@@ -1373,7 +1374,7 @@
             else:
                 self.logger.debug('Trying server %r without ssl' % server)
                 server = imaplib.IMAP4(server)
-        except (imaplib.IMAP4.error, socket.error, socket.sslerror):
+        except (imaplib.IMAP4.error, socket.error, ssl_.SSLError):
             self.logger.exception('IMAP server error')
             return 1
 
@@ -1415,7 +1416,7 @@
         finally:
             try:
                 server.expunge()
-            except (imaplib.IMAP4.error, socket.error, socket.sslerror):
+            except (imaplib.IMAP4.error, socket.error, ssl_.SSLError):
                 pass
             server.logout()