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[OCLUG-Tech] Nullmailer on Ubuntu 12.04

Last year I decided to teach myself a bit about Linux and setup a Linux server at home. It is being used as a webserver, as well as having a c++ development toolchain. I also use it for developing 'Meteor' apps.
In the past month, I have realized that some blacklists have decided to 
list my IP. Spamhaus suggests in its documentation that my outgoing 
email is not correctly using SMTP Authentication.
I suspect my problem is with nullmailer, and the fact that it does not 
seem to support STARTTLS on ubuntu 12.04.
Is there any way I can tell from email headers whether smtp 
authentication was used in sending a particular email?
Anyway, I am looking to hire a linux consultant, on an hourly basis, to 
help me resolve this issue; and in the future, also help me setup a few 
other unrelated tweaks on my server (such as running two versions of PHP).
Are there any ubuntu experts on this list available for occasional 
hourly contract work? If so, feel free to contact me.
David