If I run otrs.checkModules I get the list below. Why Net::POP3::SSLWrapper and Net::IMAP::Simple::SSL are missing?
 
From our postmaster I understand we need SSL over IMAP/POP3 and SMTP. I suppose SSL over POP3 means the OTRS option POP3S.
 
C:\Program Files\OTRS\OTRS\bin>..\..\StrawberryPerl\perl\bin\perl.exe  otrs.checkModules
   o CGI............................ok (v3.42)
   o Date::Pcalc....................ok (v1.2)
   o Date::Format...................ok (v2.22)
   o DBI............................ok (v1.607)
   o DBD::mysql.....................ok (v4.005)
   o Digest::MD5....................ok (v2.38)
   o Crypt::PasswdMD5...............ok (v1.3)
   o LWP::UserAgent.................ok (v5.821)
   o IO::Scalar.....................ok (v2.110)
   o IO::Wrap.......................ok (v2.110)
   o MIME::Base64...................ok (v3.07_01)
   o Mail::Internet.................ok (v2.04)
   o MIME::Tools....................ok (v5.427)
   o Net::DNS.......................ok (v0.63)
   o Net::POP3......................ok (v2.29)
      o Net::POP3::SSLWrapper.......not installed! (not required / for SSL connections)
   o Net::IMAP::Simple..............ok (v1.17)
      o Net::IMAP::Simple::SSL......not installed! (not required / for SSL connections)
   o Net::SMTP......................ok (v2.31)
      o Authen::SASL................ok (v2.11)
   o Net::LDAP......................ok (v0.39)
   o GD.............................ok (v2.35)
      o GD::Text....................ok (v0.86)
      o GD::Graph...................ok (v1.44)
      o GD::Graph::lines............ok (v1.15)
      o GD::Text::Align.............ok (v1.18)
   o PDF::API2......................ok (v0.69)
      o Compress::Zlib..............ok (v2.015)
   o XML::Parser....................ok (v2.36)