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https://forums.xfinity.com/t5/Email-Web-Browsing/550-5-1-0-quot-sender-rejected-quot-error-message-when-I/td-p/1968323
Dec 24, 2013 · @daywit wrote:. Diagnostic-Code: smtp; 550 5.1.0 <[email protected]> sender rejected. I spoke about this with a Comcast representative today, who told me that the problem is on my side, but I continue to find that hard to believe, because email recipients at all other ISPs, including at least gmail, yahoo, sbcglobal, and many others, receive emails just fine from my domain.
https://www.xfinity.com/support/
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https://groups.google.com/d/topic/alt.consumers/ihDuoBKD2pU
Mar 30, 2006 · 550-208.--.---.--- blocked by ldap:ou=rblmx,dc=comcast,dc=net 550 Comcast does not support the direct connection to its mail servers from residential IPs. Your mail should be sent to comcast.net users through your ISP. Please contact your ISP or mail administrator for more information. (in reply to MAIL FROM command)
https://answers.microsoft.com/en-us/windows/forum/windows_10-other_settings/live-mail-outbound-blocked-after-windows-10/9770647e-322a-40bd-a7db-37ed617f0298
May 26, 2017 · Tech support scams are an industry-wide issue where scammers trick you into paying for unnecessary technical support services. You can help protect yourself from scammers by verifying that the contact is a Microsoft Agent or Microsoft Employee and that the phone number is an official Microsoft global customer service number.
https://forums.businesshelp.comcast.com/
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https://www.xfinity.com/support/articles/troubleshooting-no-dial-tone
Troubleshoot your voice service. Troubleshoot your voice service. What to Do If You Don't Have Dial Tone with Your Xfinity Voice Service
https://acenet.aceservices.com/
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https://www.dslreports.com/forum/r15326932-550-5-1-0-Address-rejected-Error-in-Outlook~start=30
Jan 31, 2006 · Oh and I did try again Friday night to call customer support and after 10 minutes did not get to speak to someone. ... They set up the rules as to what traffic does and does not go out on ports ...
https://forums.businesshelp.comcast.com/t5/Microsoft-Communications/Email-Rejected-Spamhaus/td-p/4712
Apr 24, 2013 · If you are a Comcast Commercial Services customer and need support, please contact [email protected] This still does not explain why my comcast email account is being blocked by Spamhaus/Comcast. If you look at the bounceback, it is is from a Comcast server rejecting my comcast email account???!
https://forum.directadmin.com/threads/550-error.2606/
Jun 09, 2006 · Since comcast.net requires a valid sender the questions are does your domain exist? Does the user you're sending from exist? Does your domain properly resolve to your DA system? If all these questions are yes but your exim.conf file is empty, …
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