Too many emails sent instead of one email

Hello-I am receiving multiple emails from the postmaster stating that that the number of emails sent exceeds the maximum number the account will open. This stared about 4 days ago. I had www.comcast.net receiving email from www.hotmail.com(Outlook.com) via Email Forwarding. I disabled Email Forwarding in www.comcast.net to eliminate multiple emails being sent to  Hotmail. I saw options for Forwarding one email to other addresses but no way to Forward emails from Hotmail to xfinitty connect. I do not get many options on Outlook.com(Hotmail) and I need to know if this is possible? The reason is if one email address is hijacked, I will still be able to receive all mail from the other  email account. How can I stop these multiple emails being sent?I am running Win8.1,IE11,12 GB memory and 1TB SATA HD.Thanks.