This is in response to the post by stapel.
You make very good points. However I would like to clarify a few things.
if you block access to any e-mail address you don't recognize, how will you ever communicate with anyone new?
For those that you do speak with, you can add them to your verified list ahead of time. When they send you an email, their email will go straight through. For those that you do not know, they will be put into an Unverified email folder. You can still view this folder and read all the emails, however they are "quarantined" in a sense until either they verify themselves or you see their email and verify them.
In addition to this, we provide SMTP service so when you send emails, the recipient is automatically added to your verified list so when they respond, it goes directly into your inbox without any delays.
...and then wait to hear if I've been approved -- or else keep re-sending my replies until my message finally makes it through
The Gafana process is instant. You click the link, enter the code and your email immediately gets sent (and it will tell you right there on the screen).
Now think about your site: Do you have an online business with lots of new prospects? Do you receive many queries regarding your site?
I use this for Gafana and never have a problem. Most people that are competent enough to send an email are competent enough to perform the verification. One of our customer's is a 74 year old man. He is a violinist and still performs for weddings, receptions, business events...etc. He is not very computer-savvy, but has praised Gafana for being so simple and effective. He has not experienced any problems with his prospects getting in contact with him, and even his friends (similar age) have no problem performing the verification. The point is, that although your argument is valid, in practice it has not been a real problem
However, if this is of real concern for any potential users, we have already begun development on a web-submission form that can be placed on your website which will pass all inquiries directly to your inbox without having to perform the verification process. So for potential customers to reach you, they just fill out this submission form and there is no problem. Please keep in mind, this is not ready yet and will only be available for those with business websites; however this is to illustrate we work hard to find a solution for every foreseeable problem.
...I don't think this method is the solution to the problem
Your input is appreciated. However, I've been using Gafana myself since we started and I don't even remember what SPAM looks like anymore