No company is perfect. Not even Google. So, marketers who sent email campaigns to or from Gmail accounts last week may want to check their recipient list. Yvonne Bell points to a bug in Google Gmail that blacklisted users. The bug resent multiple emails, even when the recipient deleted the message. Google believes this bug only affected less than 2.5% of its 176 million users, Bell tells us. A Google employee wrote and posted an apology on the Gmail help form.