One domain being sent to Spam every time in Outlook Classic?

[Aprisa]

All of the emails for one of our customers keep being sent to Spam in both the Outlook programs we have running on two PC's.

It's just that one domain, all other emails coming in are fine.

I've put the sender in Safe, the domain in Safe, the address they send the mails to is a forwarding address that then sends on to the two desk top addresses so I have added the rule that any mails sent to birmingham@********.co.uk is treated as safe.

I've stopped the spam filter on our email server which is Titan mail.

Has anyone had the same and found a way around? it's a bit embarrassing as this particular customer wants to order each job by email so there is a trail.

[Haltamer]

Is there something amiss with their setup?

In my experience, It's usually bad SPF / DMARC configuration on their side - E.g. Their SPF Records are setup for a different server, so they're sending what appears to be an impersonated message.

[Aprisa]

I'm not confident enough in IT to be able to suggest that to them, is that something they could check their end?
I didi notice that on our server setting it said our email reputation was good is that something they may not have?
Thanks

[Matty_]

Haltamer said:

Is there something amiss with their setup?

In my experience, It's usually bad SPF / DMARC configuration on their side - E.g. Their SPF Records are setup for a different server, so they're sending what appears to be an impersonated message.

This. Google and Microsoft are getting pretty stringent with poorly configured email domains, so I suspect they're missing something.

I'd just raise it with them and ask them to speak to their IT Team and let them investigate, especially as everyone else is fine - if you're feeling techy, you can run free SPF/DMARC checks on their domain from somewhere like MXToolbox, but they not easy to understand unless you're familiar with the terms.

[Aprisa]

I ran the tests on their domain as you said and got this:-
No DMARC Protection

So I presume this means you are both correct and they are being rejected for the reasons you say. Thanks