[ubuntu-za] Security Error from dovecot

[Alf Stockton]

I and my users get the Security Error as displayed in the attached image 
from my Ubuntu server whenever I collect my email.
Please suggest how I remove this certification from my server.

-- 
Regards,
Alf Stockton		www.stockton.co.za

Seeing that death, a necessary end,
Will come when it will come.
		-- William Shakespeare, "Julius Caesar"
My email disclaimer is available at www.stockton.co.za/disclaimer.html
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Screenshot-Certificate Viewer:"UbuntuHal".png
Type: image/png
Size: 50739 bytes
Desc: not available
Url : https://lists.ubuntu.com/archives/ubuntu-za/attachments/20080302/dca9be41/attachment-0002.png 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Screenshot-Server Certificate Expired.png
Type: image/png
Size: 20989 bytes
Desc: not available
Url : https://lists.ubuntu.com/archives/ubuntu-za/attachments/20080302/dca9be41/attachment-0003.png