hi hope somebody here can help

user was interrupted (by a password change nag) while sending an
email.
after the password was changed, user continued to send mail but was
greeted with the following:

Are you sure? This message was already sent to one or more recipients.
If you send it again, some recipients may receive more than one copy
of the message. Select Yes to continue, Noe to cancel sending.

After clicking 'No', it appears the message was apparently not sent
and not saved in Sent Box.

This doesnt look like a common error and I can't seem to reproduce
it..

Any ideas appreciated.