email address sometimes invalid

I'm responsible for maintaining data lists for two organizations. To that end, I receive a lot of emails dealing with delete, add, modify.

Recently, two people report that attempts to send an email to me fail to recognize my email address. I've made sure they are spelling it correctly.

My machine is Win 7. They are using Win10.

Question: Is this a Win10 thing, or is something else going on?
Norma PosyPhysicistAsked:
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The characteristics of the machine from which you access your email are not an issue here, the characteristics of your mail server are relevant (I don't think you'd be asking this question if you were running your own email server on your PC).

Being able to see the NDR (non-delivery report) would go a long way in trying to diagnose the problem.

One not very pleasant possibility is that your mail server has been blacklisted by a service subscribed to by the mail service used by the people who report being unable to email you.

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mike harnettCommented:
Not sure what you mean by data lists but as mentioned above paste the NDR that the 2 users are getting when trying to email you

Maybe an idea to give a bit more info about your setup.

Are these 2 people in the same company and does everyone at that company have the same issue?

Have they been able to email you before this issue started and if so what changed?

Are you still getting emails from other people on that address?

Mike Harnett
NFE Systems
Youtube channel -
Norma PosyPhysicistAuthor Commented:
Yes, other people are emailing me just fine.

I will try to get a copy of the NDR from the two people who can't email me. It may take a few days. They will have to print it out and snail mail it to me.
Norma PosyPhysicistAuthor Commented:
I've asked others to send a test email to that address, from a variety of OSs, including Win10.
No problem.

It may take a while to get my hands on the NDR from the two who are having difficulty.
So, I am closing this question for now. With thanks to you all.

When I have the NDR I may see what's wrong myself. If not, I will re-post the issue here, armed with that information.
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