Hi All, With the below setting (cropped), the ssl certificate(signed by godaddy) don?t seems to work. It will still ask me if I want to accept this certificate. I have use the same certificate for apache host and postfix it works without any prompt. dovecot version : 2.0.19 # OS: Linux 3.2.0-32-generic-pae i686 Ubuntu 12.04.1 LTS Dovecot config: ssl = required ssl_cert = </aaa/4/merged5.crt ssl_key = </certs/proximityjobs.key userdb { args = /etc/dovecot/dovecot-mysql.conf driver = sql } verbose_ssl = yes protocol lda { auth_socket_path = /var/run/dovecot/auth-master lda_mailbox_autocreate = yes log_path = /var/log/sieve.log mail_plugins = quota sieve autocreate acl postmaster_address = root } protocol imap { imap_client_workarounds = tb-extra-mailbox-sep mail_plugins = quota imap_quota autocreate acl imap_acl } protocol pop3 { mail_plugins = quota pop3_client_workarounds = outlook-no-nuls oe-ns-eoh pop3_uidl_format = %08Xu%08Xv } Best Regards, Sheng Wei