Monitor your ads better
An improvement would be to verify sponsored ads mixed in with users emails, one came up as a check box for something that just said Johnson as the sender's name, clicked the check box, immediately it came up as OTTO Insurance which was a link that ended up being clicked, at the exact spot the box was and sent me to a page that my antivirus had to block and shut down then page. If hiding viruses in with someone's email is an attempt to get people to get the paid no ad version then i'm just going to leave, if this becomes common practice with phishing and other emails to cover an ad that doesn't show as an ad until trying to just delete the email, then i'm just going to leave. Do better Yahoo. This is unacceptable.