Static IP in blocklist due to abuse by other IPs

@Comcast_Sheila​ not sure how to do this, nobody matching Xfinity Support shows up when I try searching. A ComcastBiz_Support entry does show up.

Not to worry, thank you for letting us know. We got you covered. :)

 Please send us a direct message using the steps below with your full name, business name, full address, and phone number. By clicking the "message" icon in the upper right page of our forum page. Once you click on that, input our shared handle (Comcast Business) to send us a private message.

• Click "Sign In" if necessary
• Click the "Direct Message" icon in the top right corner
• Click the "New message" (pencil and paper) icon
• The "To:" line prompts you to "Type the name of a person". Instead, type "Comcast Business" there
• - As you are typing a drop-down list appears. Select "Comcast Business" from that list
• - An "Comcast Business" graphic replaces the "To:" line
• Type your message in the text area near the bottom of the window • Press Enter to send it

You can find the static IP information and details using the steps outlined at the following link: 
https://business.comcast.com/support/article/internet/comcast-business-internet-view-your-static-ip-address
From here, you may be able to determine perhaps why they are listed there. 

Hello, @SMS. Thank you for reaching out over Comcast Business Forums, you have contacted the right place in regard to the black listing. We do have a great site were you can report issues with not being able to send e-mail to comcast.net: https://spa.xfinity.com/ > Report > then in the drop down options you would want to select the I'm not able to send email option. 

@user_99df7e Thank you for reaching out on our Comcast Business Forums. I can understand the frustration if you have a blocked IP. What we recommend is to call our Customer Security Assurance team at 1-888-565-4329 for assistance.