diff --git a/Lib/mailbox.py b/Lib/mailbox.py
index 728ce2a..b74eeb5 100644
--- a/Lib/mailbox.py
+++ b/Lib/mailbox.py
@@ -554,7 +554,7 @@
                     f = open(self._path, 'wb+')
                 else:
                     raise NoSuchMailboxError(self._path)
-            elif e.errno == errno.EACCES:
+            elif e.errno in (errno.EACCES, errno.EROFS):
                 f = open(self._path, 'rb')
             else:
                 raise
@@ -1905,7 +1905,7 @@
             try:
                 fcntl.lockf(f, fcntl.LOCK_EX | fcntl.LOCK_NB)
             except IOError, e:
-                if e.errno in (errno.EAGAIN, errno.EACCES):
+                if e.errno in (errno.EAGAIN, errno.EACCES, errno.EROFS):
                     raise ExternalClashError('lockf: lock unavailable: %s' %
                                              f.name)
                 else:
@@ -1915,7 +1915,7 @@
                 pre_lock = _create_temporary(f.name + '.lock')
                 pre_lock.close()
             except IOError, e:
-                if e.errno == errno.EACCES:
+                if e.errno in (errno.EACCES, errno.EROFS):
                     return  # Without write access, just skip dotlocking.
                 else:
                     raise
diff --git a/Misc/NEWS b/Misc/NEWS
index 5155f03..bed3edc 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -37,6 +37,10 @@
 Library
 -------
 
+- Issue #11306: mailbox in certain cases adapts to an inability to open
+  certain files in read-write mode.  Previously it detected this by
+  checking for EACCES, now it also checks for EROFS.
+
 - Issue #11265: asyncore now correctly handles EPIPE, EBADF and EAGAIN errors
   on accept(), send() and recv().