I've just noticed that some of my incoming mail has had a spammy advert looking thing attached to the end of it. This is not present when accessing my Yahoo! Mail account through my iPhone or the web application - only via Lion's mail.app.
My guess is that Yahoo are trying to recoup some of the ad income that they're losing out on by Mac users using mail.app to access IMAP mail vs people going to their website (Yahoo use a modified version of the IMAP protocol which stopped mainstream mail clients accessing it).
Problem is, they seem to be applying this across the board - I pay for a Yahoo Mail Plus account which is advert free yet I'm getting these spammy messages.
TODAY(Beta) • Powered by Yahoo!
{some junk news story}

I've emailed their support team and have sent them a tweet but haven't heard anything as yet about the issue.
My guess is that Yahoo are trying to recoup some of the ad income that they're losing out on by Mac users using mail.app to access IMAP mail vs people going to their website (Yahoo use a modified version of the IMAP protocol which stopped mainstream mail clients accessing it).
Problem is, they seem to be applying this across the board - I pay for a Yahoo Mail Plus account which is advert free yet I'm getting these spammy messages.
TODAY(Beta) • Powered by Yahoo!
{some junk news story}

I've emailed their support team and have sent them a tweet but haven't heard anything as yet about the issue.