How to make sure email you send is not automatically marked as spam?

I run a social video website. User's across varied geograph开发者_JS百科ic location use this website for e-mailing about the video contents to other people. But my clients report that e-mails they send are automatically marked as spam.I do not want my e-mails marked directed to the spam folder. What can i do to avoid this scenario?

Thanks.

I'd recommend looking into sending your emails through Google Apps. You verify with google you own the domain and Google that you own the domain and then you can use google as the outgoing mail server.

Servers can get black-marked for spamming, so if you're on a shared server it could be that your server is on a blacklist. You can know for sure that Google's servers wont be blacklisted..

Google apps is free and easy to setup (I have it on both my sites), if you want to send more than 500emails you have to pay x amount/month, can't remember how much.

Here are some useful links:

1. http://www.google.com/apps/intl/en/business/index.html
2. http://www.readwriteweb.com/enterprise/2011/01/google-apps-users-can-now-sign-e-mail-with-dkim.php?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+readwriteweb+(ReadWriteWeb)
3. http://www.mxtoolbox.com/blacklists.aspx (see if your server is blacklisted)

Another thing to bear in mind is make sure you have a Privacy Policy (ie what you plan to do with users data) as a lack of Privacy Policy can lead to blocking from some email providers such as Yahoo

Hope this helps!