ActionMailer SSLError hostname was not match with the server certificate

So I am setting up a Continous Integration server using CruiseControl.rb and was getting these errors. I am on a RoR 3.1.x env and pointing to my local (same server) postfix for SMTP. I don’t need SSL.

OpenSSL::SSL::SSLError (hostname was not match with the server certificate):
/usr/lib/ruby/1.8/openssl/ssl.rb:123:in `post_connection_check’
/usr/lib/ruby/1.8/net/smtp.rb:582:in `tlsconnect’
/usr/lib/ruby/1.8/net/smtp.rb:562:in `do_start’
/usr/lib/ruby/1.8/net/smtp.rb:525:in `start’

Gave me a clue as to the problem. But adding this line

# Turn off auto TLS for e-mail
ActionMailer::Base.smtp_settings[:enable_starttls_auto] = false

to my config/environments/ci.rb does not work. I was still getting the same error. So poking around in ActionMailer gem source code gave me the last piece of clue I needed.

I also need to set this flag:

:openssl_verify_mode => false

Putting everything together,

ActionMailer::Base.smtp_settings[:openssl_verify_mode] = false
ActionMailer::Base.smtp_settings[:enable_starttls_auto] = false

is all I need. Turning off starttls is not needed, but I’d do it anyway because I am talking to my local SMTP server and don’t want the overhead.