Email marketing does not benefits from the SEo perspective. It is good only if you have a product or service that you want your members to catch with. And please make sure that you do not spam through email marketing and you provide double opted subscription service for users to opt out whnever they wanted to. I hope this helps.
creating a news letter about our site and collecting emails and distributing that news letter to several emails is know an email marketing. by doing email marketing we can increase traffic and sales to our website.
Some providers such as verticalresponse.com have an automated feature that will post your sent email to social networking sites like Twitter & Facebook. This could help with seo depending on how you use "anchor text" with in the body of the message. Email marketing companies have free tutorials on their website like iContact.com - chk it out!
One of the best way of email marketing is through social networking sites. Mail interesting information related to your site to your social networking friends or email them. Its the latest way of email marketing.