Ken - what will you use the email list for? Are they signing up to receive news from you on jobs? Will this be a newsletter service from you?
I use Constant Contact email service for several clients. It is a good solution and one I think would work for your needs. You can also use it free for awhile to try it out, play around with it, do some tests, etc. It is pretty easy to use. Once you set it up, it manages your lists for you and has some great tracking tools, too.
I know a ton about bulk Email lists. You`ll need a custom solution. Reason being is you`re sending email notifications about jobs, not a real email `list` per say. If you want, I can help you out more.
email me directly
bfleming98 at gmail.com