I recently uninstalled McAfee and replaced with the trial verions of NOD32 2.7 on my wife's computer. She runs a home business and often sends out mass emails. The first time she tried after NOD was installed, they ALL came back as undeliverable. She tried sending them out in smaller groups and they went through. Previous to installing NOD, she sent out many mass emails and did not have them bounce back. The emails all had a message about (paraphrasing) the recipient ISP being down. The emails came back in groups sorted by ISP. So one email said all the @yahoo.com ISP was down; the next email said all the @gmail.com ISP were down, etc. Can anyone tell me if this could be related to NOD32? Is there a setting that I can adjust to allow mass emails to be sent out? Thanks.