squirrelmail shown email delivery error 65

squirrelmail shown email delivery error 65 under user mailbox 554 transaction failed spam message not queue.

It complains Can't excute command '/usr/sbin/sendmail -i -t -f user@example.com'
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lenamtlConnect With a Mentor Commented:
You have probably not set up the correct user in the 'email addresses' section and this is  trying to use the Mailbox name instead.  
Chage this to a working email address in the 'emai addresses' section of the control panel this will probably fix the problem.

TenchaAuthor Commented:
It was a combination of things and this one was part of it.
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