Gmail flagging subscription email from EasyDiscuss but not EasyBlog

Hi, I have setup subscription cron jobs for EasyDiscuss and EasyBlog. The emails from EasyBlog and other extensions such as RSForm are working fine. But the emails from EasyDiscuss are being flagged by gmail as: "? for logo" and the message that "gmail is unable to authenticate the sender, maybe a spammer. "

Seems like some EasyDiscuss setup since other extensions are working fine. Also, had my web host check the email settings. Any ideas on what may be happening?

Thanks!!
Debaleena