OTRS 5.0.16  has been installed.

The file  Kernel/System/MailAccount/POP3S.pm is patched as per below link.

Check the patch below

https://github.com/OTRS/otrs/commit/8cb87ff9ef9789606a38e3d70599e38a1f8e9246

But still, we received every 10 min below message :

[Sat Feb 18 14:20:02 2017] otrs.Daemon.pl: using SSL support of Net::POP3 3.05 instead of SSLGlue at /opt/otrs/Kernel/cpan-lib/Net/SSLGlue/POP3.pm line 12.

Best Regards / Cordialement
-----

Placide Lysias NJAMI | IT MANAGER
GOLDEN EXOTICS LTD – GHANA
P.O. Box K.I.A. 16105 - ACCRA
Email: p.njami@gelgh.com

-----Message d'origine-----
De : Helpdesk GEL [mailto:helpdesk@gelgh.com]
Envoyé : samedi 18 février 2017 14h 20
À : admin@gelgh.com
Objet : OTRS Scheduler Daemon Cron: MailAccountFetch

[Sat Feb 18 14:20:02 2017] otrs.Daemon.pl: using SSL support of Net::POP3 3.05 instead of SSLGlue at /opt/otrs/Kernel/cpan-lib/Net/SSLGlue/POP3.pm line 12.