Email went to another recipient

My client told me the following:

He received a private email from "Client A" yesterday.

Today "Client B" contacted him and forwarded him the very same message from Client A because she recieved it in her mailbox, even though it was addressed to my own client only.

So how would client B recieve this email, and what can I do to stop that from happening again? I just ran ccleaner and TDSS killer, and am now running Malwarebytes, and will also run SAS.

Thanks for any insight. I'd like to be able to prevent this in the future.
bricar1PresidentAsked:
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David Johnson, CD, MVPConnect With a Mentor OwnerCommented:
It isn't something wrong on your end.

Check the message headers of the message that you received from Client A against the headers from Client B (there might be enough information on the forwarded message).
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SmightyConnect With a Mentor Commented:
you should check the message first and ask the sender if he/she has attached "client B" to BCC the mail. it would explain why she's getting Client A's mail.

Since you didn't mention your mail server, we (or at least I) cannot suggest anything more than that.
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arrorynConnect With a Mentor Commented:
Also check if Client A has set up any auto-forwarding rules that he or she has forgotten about (assuming they are within the same business).
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bricar1PresidentAuthor Commented:
Neither client knows the other so it would be highly unlikely that Client B would be in Client A's mailbox. They are separate residences in different towns and are both clients of my customer who reported the issue.
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arrorynConnect With a Mentor Commented:
How do they receive their emails? Do they utilise any servers / cloud-based solutions, or is it just basic Hotmail / Outlook etc etc.
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bricar1PresidentAuthor Commented:
It's difficult to determine because my customer is in a private practice that requires extreme privacy protections. It's just the nature of his business. He is in contact with Client B right now (the one who received the email that was addressed to my customer) to see if there is any possiblity that her e-mail address would be in Client A's contact list.
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
The first question is the email a legitimate business email from your customer.  If it is not, there are many ways that others can send an email (spam) to both clients and have the addressing show only one name.
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bricar1PresidentAuthor Commented:
I really wasn't able to get to the bottom of this issue. I split the points between all experts who responded. It seems this was some kind of weird one-time thing. I think this one I'll just have to let go.

Thanks for your suggestions!
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