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All emails that I send to an att.net or sbcglogbal.net are blocked and come back undeliverable- how can I fix. This problem just started today.

dandewhite
dandewhite
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All emails that I send to an att.net or sbcglobal.net address are blocked and come back as undeliverable. This problem has just started today. For many months I've sent these emails without any getting blocked.

All emails that I send to an att.net or sbcglobal.net address are blocked and come back as undeliverable. This problem has just started today. For many months I've sent these emails without any getting blocked.

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amanchesterman
amanchesterman
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Which company provides your email service? It sometimes happens (it happened to me once) that one ISP blocks all messages from another one because that domain is being used by people sending spam. I'm not suggesting that you are spamming of course, but if others who use the same ISP domain are doing so that can lead to your ISP being blocked by others. As a first step to a solution I would contact your mail service provider and ask if other users have reported the same difficulty.