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-rw-r--r--Lib/mailbox.py7
1 files changed, 5 insertions, 2 deletions
diff --git a/Lib/mailbox.py b/Lib/mailbox.py
index 39968c6..4043d74 100644
--- a/Lib/mailbox.py
+++ b/Lib/mailbox.py
@@ -740,8 +740,11 @@ class _singlefileMailbox(Mailbox):
"""Append message to mailbox and return (start, stop) offsets."""
self._file.seek(0, 2)
before = self._file.tell()
- if len(self._toc) == 0:
- # This is the first message
+ if len(self._toc) == 0 and not self._pending:
+ # This is the first message, and the _pre_mailbox_hook
+ # hasn't yet been called. If self._pending is True,
+ # messages have been removed, so _pre_mailbox_hook must
+ # have been called already.
self._pre_mailbox_hook(self._file)
try:
self._pre_message_hook(self._file)