Are these e-mails listed in the "Sent Items" folder? How about the "Outbox"
folder? You may consider the following options:
Outlook>Tools>Options>Preferences>E-mail>E-mail options> uncheck
automatically save unsent messages and Tools>Options>Mail setup> Clear "Send
immediately when connected". This option may provide the opportunity to
check if messages are ending up in the outbox folder.
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