Senders from particular mail server receiving undeliverable to my email address

[Gemma+W]

I recently changed my password on my Sky Yahoo Mail account following a data leak.

Since then, emails being sent from my children's school are being sent back undeliverable even if they reply of an email sent to them from me.

Any email I send to them (different email addresses but the same domain) are received but they aren't able to reply as undeliverable.

We have tested a reply to my home email address and Cc my work email to determine which end appears to the issue and I receive and can reply with no issue via my work email.

I appear to be receiving all other emails sent to my Sky Yahoo account with no issue.

Any suggestions?

[caesarome]

You will be best served by changing your email address with the school to a more reliable provider like Gmail where issues like this will not occur.

[Gemma+W]

Not really the solution I was looking for - until now I have never had an issue like this, so in that respect has been reliable for me.

[jayach]

Could you ask the school for the complete error message in the undeliverable report.

If you then post it here, removing any personal details, we may be able to offer a reason.

Would they possibly be using an Outlook address, as there have been previous reports of problems from that domain?