AOL discusses Invalid Recipients and what you should look out for to avoid trouble. This may be related to an earlier posting by Word to the Wise regarding some information AOL was looking to collect from senders.

Yahoo discusses some of the security features of the new Preview pain, including why they use Image blocking and some notes on Spoofing and Script protection, in this post Answering concerns about Preview Pane.

Gmail Releases some new features for Google App users and some fresh tips onimporting old email to Gmail.

Microsoft has some tips for a blank email issue that some of their users were experiencing, and anti-spam engineer Terry Zink discusses Safe Senders features in Microsoft’s products.