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Interestingly, the bug still exists and the mail app has not been appropriately updated by Microsoft yet.

I wonder how many people have already unwittingly breached GDPR because of this?

This is really odd. My friend has updated his Mail app to the recently issued version –

16005.12228.20356.0 – but a test message sent this morning still contains all the bcc addresses in full (visible again on my iPhone 6).

Have asked him to reboot his pc in case that’s what’s needed to complete the installation…?

b wrote:

This Microsoft Community thread and Feedback Hub problem report confirm that it’s the combination of sending from Windows 10 Mail with a Gmail account which incorrectly causes visible BCC recipients:

When I use Bcc in Mail on Windows 10 it doesn’t hide the addresses from the recipients

Failure in Windows 10 Mail App when using BCC from a GMail account

Many thanks for spotting that. I’ve just asked asked my friend to update his Mail app and will report back after another test email!

1 user thanked author for this post.

b

Paul T wrote:

I wonder if it’s a setting in W10 mail?

Such as…?

mn– wrote:

If it happens intermittently, that’s another thing.

In the case of the user who sent me the above emails, it happens every time he sends out emails including bcc addressees.

Yes, I’ve had a look at the source code and can confirm the bcc addresses are all shown there in full, whereas on the browser email they are not.

I wonder is someone else with Win 10 Mail app version 16005. 12228. 20276. 0 can replicate the problem.

Here we are. He sent me two emails – both addressed to 5 bcc email addresses – one from his Win 10 Mail app and one via the same Gmail account but using a browser.

The attached picture shows how the 2 mails appeared in MS Outlook and on my iPhone 6. Please note that even the browser email shows one bcc address but it is only for the receiving address ie it does not reveal any of the other addressees whereas the Win 10 Mail app email does.

Any thoughts…?

PS I have redacted the names etc for privacy reasons

jabeattyauditor wrote:

WSVictor Delta wrote:

Paul T wrote:

Can he connect directly to his mail server via a browser and send an email from there? That will remove Windows mail from the equation.

cheers, Paul

He could but he doesn’t want to. The app is more convenient. Anyway, he shouldn’t have to, the app should work correctly.

I believe Paul was suggesting that as a troubleshooting step – take the app out of the equation to be certain it’s the app causing the issue.

Thanks and apologies – I should have read Paul T’s post more carefully.

I will ask him to send me two similar emails, both containing bcc addresses, one from the W10 Mail app and the other by accessing Gmail via his browser. I’ll then post copies of the two, as they appear on my iPhone.

Paul T wrote:

Can he connect directly to his mail server via a browser and send an email from there? That will remove Windows mail from the equation.

cheers, Paul

He could but he doesn’t want to. The app is more convenient. Anyway, he shouldn’t have to, the app should work correctly.

The person whose emails first drew my attention to this problem has been away but is now back. He writes:

The app I use is Windows 10 mail.

My current version is:  16005. 12228. 20276. 0

The last update = 26/11/2019

So a different version to the one tested by mn-

[WSVictor Delta]

I’m trying to get more details and the exact version info etc from the sender.

• This reply was modified 5 years, 6 months ago by WSVictor Delta.

Thanks. And which iPhone did you receive the messages on…?

jabeattyauditor wrote:

WSVictor Delta wrote:

Something very odd is happening and I can’t quite believe it!

I can access my emails via MS Outlook on my home pc and also my iPhone. Recently, I’ve noticed that I can see the bcc (blind carbon copy) addressees in full (ie names and email addresses) on some emails on my iPhone, although they appear correctly (ie without showing the bcc addresses) on MS Outlook.

I can hardly believe this is possible because, as I understand it, the bcc address info is not sent to other recipients – so it should not be there for me to see.

All of my software is fully up to date. I’ve checked and I can see the bcc info on another iPhone too when accessing my email account.

Can anyone explain what is happening please, and has anyone else experienced it…?

What smtp server are the affected messages sent through? Some years ago, outlook.com had a configuration issue causing bcc’d messages to be processed in such a way that the “hidden” addresses were moved to the “To” line.

Perhaps that bug has surfaced again or is affecting a different provider. IIRC, it wasn’t a mail client issue in that particular instance.

They are being sent via a Gmail account.

[WSVictor Delta]

Paul T wrote:

This just means the BCC info was left in by the sending mail program / server and some mail clients choose not to show it.

cheers, Paul

Yes, but it’s pretty poor of the Windows 10 Mail app to do this as it could cause the sender to unwittingly breach GDPR.

When you send an email with bcc addressees, you don’t expect them to be visible to some recipients.

• This reply was modified 5 years, 6 months ago by WSVictor Delta.

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Mr. Austin

[WSVictor Delta]

Mine is an iPhone 6. My wife’s iPhone 5 gives the same result.

However, a friend’s iPhone 8 doesn’t show the bcc addresses on the same emails.

All are using the latest software available.

• This reply was modified 5 years, 6 months ago by WSVictor Delta.

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Mr. Austin