Office 365 email from LA undeliverable

[webby74]

Hi All

 

We have just migrated our onsite exchange to Office 365. Everything is working great, it seems easy to manage and use. However we have one slight issue. When a Local Authority send us an email they get an undeliverable message.

 

Now we have not had any other similar issues from any other people emailing us, its just from the one LA domain. So anyone who works for this local authority get a undeliverable message back. They receive emails from us just fine.

 

Now I have checked everything I can think of (including DNS records and Junk & spam settings) and I come to the conclusion that it must be their end. We have kept the same email address for staff so their isn't an issue with it being sent to the wrong address.

 

Anyone come across a similar issue?

 

Regards

 

Webby74

[Marshall_IT]

Did the LA have local dishes settings for your on-line exchange? They might not have removed them.

[edutech4schools]

We had something similar when SEGFL had added our new MX & DNS records but not removed the old ones.