To redress the problem that an estimated 20% of legitimate email marketing messages are incorrectly identified as spam by server and client-level filtering and end up in junk mail, the NYC-based Interactive Advertising Bureau (IAB) has produced the Marketer & Agency Guide to Email Deliverability – which it bills as ‘the first comprehensive document that provides marketers with real tangible solutions to improving their email deliverability.’

www.iab.net/emaildeliverability