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

All the addresses in the blind copies field can be seen by the recipients. I have checked tested this with 5 different email addresses from several email providers. They can all see the list of recipients in Bcc. Is there a setting in the Mail app to make this work correctly? 
 

Question Info


Last updated March 26, 2020 Views 467 Applies to:
Hi
i have just tested it on mine and seems to be working as expected, can you check what version you have
open the mail app, click on the settings (gear) icon in the bottom left .
click about.
the latest is Version 16005.12308.41002.0
if yours is earlier, open the microsoft store, click on the ellipsis (...)
check downloads & updates to see if there are any pending updates to mail and calendar

if you already have the latest version
try resetting the mail app (you may have to set up the account again)
settings -> apps -> apps & features
click on mail and calendar
click advanced options
click reset.

hope that helps, please let me know how you get on

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Mine is Version 16005.12228.20276.0 and it tells me I have the latest update. 

I don't see the Advanced or Reset options. 

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sorry, for the delayed response.
i have tested further and found that this happens with a google mail account when using the mail app, seems to work properly when sending through any other account and when checking mail with a different client.
are you using a google mail (gmail.com) account?

this issue has been reported to the development team.
you can add your comments to the feedback if you wish - https://aka.ms/AA6plgf

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Thanks for your response. Yes, the account I have configured in Windows Mail is an @gmail.com account. I was also trying to help a few other people who have the same problem using Gmail with that Mail app on Windows 10. Hoping for a speedy resolution.

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with luck microsoft will fix it quickly.

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with luck microsoft will fix it quickly.

Windows 10 Mail app was updated the other day - 16005.12228.20356.0 - but a test message sent to me this morning still contains all the bcc addresses in full (visible again on my iPhone 6).

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We're two months into the new year. Is there any fix for this? Quite distressing for persons expecting the usual protection of the Bcc concept. 

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I wanted to send group mail shot ( and that wasn't easy through Windows10 mail) through Bcc, Testing using other addresses I found the Bcc could read each other and the main recipient but when I sent it to myself they can't . This is when they click on REPLY All.    I'm baffled  

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apparently still not fixed, but at least now i know why i can still see a lengthy list of contacts, even under BCC, from a gmail user.

it seems strange for this only to occur with gmail account, suggesting the problem is on their end...

but if microsoft is not at fault, i would assume there would be some sort of official update of "google servers aren't responding correctly" to our email spec standards following application.

so lacking any official update, i'm gonna say blame microsoft until proven otherwise (especially with having other longstanding bugs).

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apparently still not fixed, but at least now i know why i can still see a lengthy list of contacts, even under BCC, from a gmail user.

it seems strange for this only to occur with gmail account, suggesting the problem is on their end...

but if microsoft is not at fault, i would assume there would be some sort of official update of "google servers aren't responding correctly" to our email spec standards following application.

so lacking any official update, i'm gonna say blame microsoft until proven otherwise (especially with having other longstanding bugs).

If you google this issue, you'll find a number of threads in the Gmail help area about it. So both companies must be aware of it. However, no sign of a solution yet - which, given the GDPR implications, is extraordinary!

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