Issue with POP3s TLS/SSL on port 995 on Outlook 2016

[Bhushan Bhosale]

Dear Team,

I'm facing issue with POP3s TLS/SSL on port 995 only for outlook2016. It's working fine with dovecot v2.2.28 on test environment.
Is the dovecot v2.2.28 is stable released? I can  upgrade the version from v2.1.17 to v2.2.28 on production if its stable version.
Kindly confirm and provide the proper solution.

Thanks and Regards,

Bhushan
Previous Mail:==========I have faced issue with email downloading in the email client by using pop3s SSL port 995 in dovecot v2.1.17 for outlook client 2016 on production environment. 
As per my troubleshooting on my test environment, I have upgraded dovecot version v2.2.28, and changed paramer "ssl_dh_parameters_length = 2048" and "verbose_ssl = yes", The issue seems to be resolved in dovecot v2.2.28.
What can i do to resolve this issue in dovecot v2.1.17? Kindly help.