Intermittent issues with receiving emails

I have a user that has complained she sometimes doesn't receive an email from a few people into her inbox.

Their office 365 is configured so that if an email is sent to them from an external domain, it is BCC'd into a specific mailbox as a 'catch all'. She can see the email in the BCC mailbox addressed to her but not in her own inbox. Other users that are addressed in the email are receiving a copy in their own inbox. This is intermittent as she can receive other emails send from these people so it should rule out blocked sender and spam filter.

I have completed a message trace on the O365 tenant and it says 'delivered'. I have searched her mailbox on OWA and the specific message is not there. I have checked blocked senders and the addresses are not listed (I've added them to safe senders as a precaution)

Any ideas?
CRL ltdAsked:
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timgreen7077Exchange EngineerCommented:
Make sure the user doesn't have any outlook rules set on the mailbox that may also be moving mail around from select senders.
Gaurav SinghHead - Managed ServicesCommented:
Please check the Outlook rules any configured on Users PC
CRL ltdAuthor Commented:
Thanks guys

I've checked rules and there are none configured. She receives emails most from these people of the time without any problems, it's only occasionally they can't be seen
timgreen7077Exchange EngineerCommented:
If you checked and verified delivery via message trace, the only thing I can think is there is a rule that is moving the mail. It could be based on any criteria the rule has set and not the sender email address.
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