hey friends, I am running Postfix 2.1.5 on FC3 with TLS and Dovecot with IMAPsS & POP3s on FC3. Certificates are self sign and everytime any of the Email client like Outlook Express/Microsoft Outllook, Incredimail, Thunderbird(MS & Linux) etc connects to the Mail Sevrer they receive warning message "that the certificate is not from the trust source". The problem is more on Thunderbird and Incredimail because everytime a user tries to send any email this message comes. Is there any way that I can get of this mesage without taking TLS or shutting down IMAPs/POP3s services? For example generating certificates for clients and importing them in their respective email clients . Any guide how to get rid of this error. Please let me know if you need any further inputs. Thanks & Regards Ankush Grover