Redmine

I post this question on stackOverflow i posted here if someonelse could help me:

http://stackoverflow.com/questions/42007913/redmine-issue-to-mail-with-windows

I need to activate the option:create issue via mail, but i don't know how to do it. I read the documentation but i don't understand it. I use bitnami to work with redmine on Windows platform.

Update:

I think i more closer now but when i run on use_redmine.bat:

C:\Bitnami\redmine-3.2.3-0\apps\redmine\htdocs>rake redmine:email:receive_imap RAILS_ENV="production" host=imap.gmail.com port=993 ssl=true username=xxxxxxx@xxx.x password=xxxxx

it returns me:

OpenSSL::SSL::SSLError: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed

I d change imap.ruby as i read on other forum i update ruby gems and nothing nothing always the same error

Thanks,

Sorry for my english i am spanish.