Due to a site security upgrade, returning visitors may experience a sign-in issue.
If you do, simply delete your site cookies and this should resolve the issue.
For example, in Chrome do this:
From the "Menu" button in the upper-right corner of the Chrome window, choose "Settings" > "Privacy and security" > "Clear browsing data" > "Cookies and other site data".
Here you can search and view our site Knowledge Base. To find a specific article, use KB-article number format (ex. KB-1)
Article number: kb-38
Q. I can't send email to yahoo email addresses.
A. The problem is that yahoo is deferring all email even if it is legitimate. Please review this article to get a good idea what is happening.
http://www.ahfx.net/weblog.php?article=107
You should setup the domainkeys and spf records in your control panel if you use our linux hosting or contact us to assist in setting them up if you have our windows hosting services.