Inspect and Correct Dovecot + Postfix + MySQL setup

Hello, we have an email server currently handling ~700 mailboxes relatively successfully however we are running into issues with compatibility of email clients/programs. I believe this to be a limitation in our Dovecot and Postfix configurations. I am looking for someone who can: a) Work with the Ubuntu, Dovecot, Postfix and MySQL packages b) Has access to variety of mail clients for testing (ex. Outlook, Thunderbird, Mac Mail, iPhone) With the above required skill set/software we would need you to: 1) Inspect our Dovecot and Postfix config files 2) Make performance optimizations to configs 3) Allow email server to work with popular mail clients 4) Insure that: IMAP with SSL/TLS works on 993 POP3 with SSL/TLS works on 995 SMTP with SSL/TLS works on 465 No insecure methods work Thank you for your time, Pierre