ActionMailer logging EHLO etc

I am trying to work out why actionmailer isn’t sending emails when i
have deployed it to production. Unfortunately I do not have access to
the production box and I can only see the production.log file.
I have noticed that (on my local machine) when ActionMailer sends an
email, the console window shows a load of output regarding what
ActionMailer is doing e.g.
← “EHLO\r\n”
→ “\r\n”
→ “250-PIPELINING\r\n”
→ “250-SIZE 30000000\r\n”
→ “250-ETRN\r\n”
→ “250-AUTH PLAIN LOGIN\r\n”
→ “250-AUTH=PLAIN LOGIN\r\n”
→ “250-8BITMIME\r\n”
→ “250 DSN\r\n”
← “AUTH PLAIN AHRob21hc2hhcmUAQnVoZTNNVQ==\r\n”
→ “235 2.0.0 Authentication successful\r\n”

However, this output does not appear in the development.log. I have the
logging value (in the development.rb) set at :debug but this output only
appears in the console window.
If I can work out how to get this logging to get logged to the log file
then I think I stand a chance of working out what is going wrong on the
production box.

Any advice?