Visitor
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8 Messages
emails sent to comcast accounts being rejected
As the President of a small non-profit organization, I use a Microsoft supplied email account that ends in .onmicrosoft.com for company business. Emails sent from this account are being rejected with the following reply:
resimta-a2p-650768.sys.comcast.net rejected your message to the following email addresses:
xxxxxxxx@comcast.net
Your message was rejected by the recipient email server. Please check the recipient's email address and try resending your message or contact the recipient directly. For more tips to help resolve this issue, see DSN code 5.1.0 in Exchange Online - Office 365. If the problem continues, contact your email admin.
resimta-a2p-650768.sys.comcast.net gave this error:
<xxx@obinh.onmicrosoft.com> sender rejected
This has happened with messages sent to one of my Directors, one of my volunteers and even my personal Comcast email address.
XfinityThomasD
Official Employee
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1.6K Messages
26 days ago
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user_52t1la
Visitor
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8 Messages
3 days ago
Eventually, I got this escalated to (I think it was Customer Security Assurance Level 3) to someone who understands the issue. His answer was that the *.onmicrosoft.com domain is blocked and Comcast is not going to unblock it. The explanation was something that I didn't fully understand about a Microsoft pub stating that *.onmicrosoft.com email accounts are not intended for sending external emails. (Microsoft never mentioned anything about this when I signed up for Microsoft 365 for nonprofits.) The result is that I can send email from my Microsoft account to all my volunteers and Directors (e.g. Gmail) except those with Comcast accounts. (We are a small faith-based non-profit who helps people with needs in the Seacoast New Hampshire region. Microsoft supports us by providing cost-free licenses for Microsoft 365. (Thank you, Microsoft, your support is greatly appreciated.)
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