Mail::Sender has a debug parameter where all conversations with the server are logged to a file.

You might try adding 

 debug=>"debug.txt"
to your open call to see if anything is being captured.

Admitedly, I have never used Mail::Sender before, but have used Mime::Lite with smashing success. You might try that as an alternative if things get really frustrating.

In reply to Re: New Mail::Sender not working? by phydeauxarff
in thread New Mail::Sender not working? by neilwatson

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