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Hello, @mm580486
The issue seems not be related with SquirrelMail. From the looks of it the SSL Certificate from postfix is broken, so it is not able to start.
What you can try in order to sort the issue is to delete the broken certificate /etc/postfix/smtpd.cert and create a new one.
You can try to generate a new SSL Certifcate with the following command:
openssl req -x509 -nodes -days 7300 -newkey rsa:2048 -keyout /etc/postfix/smtpd.cert -out /etc/postfix/smtp.cert
chmod 600 /etc/postfix/smtpde.cert
After this is done you can restart postfix and try again.
service postfix restart
Hope this helps
Regards, Alex