Why is VM randomly marking some emails as junk - serious consequences

I have been using VM email since it was Blueyonder.

I have never used the online email function but always downloaded to a desktop computer.

And as far as I know in the decades I have been doing this have never had a missed email.

Today after a week of anxiety around a legal issue, it turns out VM had randomly made emails from a solicitor who I had been in communication with, junk.

Not only has this caused me problems but has made the solicitor think their email system isn't reliable.

It was pure chance that because I made the effort to see if they had arrived at the online email function, and remembered to look in junk that I found them.

Along with emails from a hosting company I have used for years so their address isn't new.. This was about financial charges etc., and could have led to me missing a payment.

This was around the same date, so somthing must have triggered this, although other emails did download.

On what basis would VM or its techies have decided to mark these as spam.

And if in fact this is a regular occurance, you should post a warning that your email provision is not a reliable one for anyone who wants the ease of being able to download to a computer.

What compensation could I claim from you, had it meant I missed an important deadline in relation to a legal matter.

This experience has left me very concerned and anxious.