How should you balance useful content with solicitations for sales or offers? One of the greatest risks of an auto-responder program is having users become frustrated with hard-sales attempts and subsequently marking your email as spam, opting-out, or simply not opening future emails. All of the aforementioned activities can lower your quality score with email service providers and make it harder for your email sends to get into the inbox. Therefore, it's very important that your auto-responders actually contain useful information. While it's acceptable to include a sales offer along with useful information in each email, it is not advisable for you to make a sales-only email any more frequently than every fifth email in the series in order to protect your email sender reputation.
The primary purpose of a transactional email is to convey information regarding the action that triggered it. But, due to their high open rates (51.3% compared to 36.6% for email newsletters), transactional emails are an opportunity to introduce or extend the email relationship with customers or subscribers; to anticipate and answer questions; or to cross-sell or up-sell products or services.[3] http://www.emailvendorselection.com/wp-content/uploads/2014/12/email_drips_hobsons.jpg
Landing Pages - The best lead generation tool of all is your product. If you have a compelling product that solves a major pain point, visitors will want to provide their contact information even without any incentives. Presenting your product in the most attractive way is often done through landing pages or sales pages, which help educate and convert prospective customers. Landing page optimization is the key to making sure you are getting the most out of these pages.
Frequency matters, and how often you send emails can have a significant impact on your revenue and email engagement (and unsubscribe) rates. Send too much and subscribers can suffer email fatigue causing them to disengage and unsubscribe. Send too few and you lose the attention of your audience. They may even forget why they signed up leading them to unsubscribe.
The basics we've gone over in this blog post are just the beginning. Keep creating great offers, CTAs, landing pages, and forms — and promote them in multi-channel environments. Be in close touch with your sales team to make sure you're handing off high-quality leads on a regular basis. Last but not least, never stop testing. The more you tweak and test every step of your inbound lead generation process, the more you'll improve lead quality and increase revenue.

Clearly, there has been a huge change in the traditional buying process.  In fact, according to Forrester, buyers might be anywhere from two-thirds to 90% of the way through their buying journey before they even reach the vendor. The reason this is happening more and more is because buyers have so much access to information that they can delay talking to sales until they are experts themselves.
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