I am using and have been using "Postbox", a desktop email client, to send and receive all my emails through my Live account on "Outlook.com" using IMAP. Everything has worked perfectly between "Postbox" and "Outlook.com" for several years and I haven't changed anything on my end. About two weeks ago, I started having problems. Now, when I put a single name or a group list into the Bcc field on my "Postbox" desktop email client and send that email through my outgoing SMTP server at "Outlook.com", the email goes through "Outlook.com" and "Outlook.com" moves all the names from the Bcc field to the TO field. I am assuming this has something to do with the new changes associated with the updated "Outlook.com/Outlook Mail" web mail process. Notes: When I do the same thing using "Gmail" for my outgoing SMTP server, my names stay in the Bcc field as they should. My Outlook.com web page now shows Outlook Mail in the top left corner. I am using imap-mail.outlook.com Port 993 and smtp-mail.outlook.com Port 587 for my servers. I tried switching to imap-mail.live.com and smtp-mail.live.com as one MS web site suggested regarding the new changes to Outlook Mail but those new setting would not connect. I tried using Mozilla Thunderbird instead of Postbox as my desktop email client and the same problem occurred in that the name in my outgoing Bcc field was put into the To field after the email was processed through Outlook.com. Based on all of the above, I believe the problem has something to do with the way the new Outlook Mail is trying to process names from the Bcc field in emails sent from my desktop email clients. I hope someone from MS can look into this problem and get back to us.

I still have this problem today 4th November 2016. I note that in one of the posts a maximum number of recipients is mentioned. What is that maximum? I am trying to send to 2 groups, one of 148 recipients, and one of 30 without success. I keep getting "error please try later".

Hi again Sean, Please accept my apologies if I wasn't clear; I wasn't actually trying to report a further bug or fault - all I was trying to point out was that the behaviour of the system prior to Microsoft introducing the bug and how the system behaves now that the bug has been fixed are, in fact, different. Both are acceptable behaviours provided you know that there is the difference - as I say, I was just pointing out that there is a difference. Should you want me to expand on that (either in another thread or this one) just ask and I shall. In the meantime though, thanks again for getting this bug cured. Best regards John

Hi John, We are unable to duplicate this issue and does not seem closely related to the issue we fixed. Can I please ask you to start a new post on this issue giving a more detailed explanation including the client you are using etc and we will try to figure out why you are receiving that additional email. We can see if others have the problem more easily with a new post as well and you can share the link here. Regards, Sean

Hi all, I'm now glad to report that I have just run a test and the bug appears fixed and everything is now working for me as it should be with my 'hotmail.co.uk' e-address. However, just as a small point of interest, it no longer works exactly as it did before the (putative) 'upgrade'. Prior to the upgrade if I sent a mail to 'x' bcc e-addresses (and included no 'to' or 'cc' e-addresses) 'x' mails would be sent. However, after the upgrade and now the bug fix, 'x+1' mails are sent; the additional (unasked for) mail being an 'echo' coming back to my Hotmail inbox. Given that there is a (very annoying) restriction on how many addressees one can include in an individual mail and also a (much less annoying, because it is understandable) higher numbered restriction on how many addressees to whom one can send in a day, I wonder if this extra mail is included in those totals. Does anybody (e.g. Sean) know? Best John

Outlook.com Moving Addresses From Bcc Field to the TO Field When Email is Sent via Desktop Email Client

Anonymous

I am using and have been using "Postbox", a desktop email client, to send and receive all my emails through my Live account on "Outlook.com" using IMAP. Everything has worked perfectly between "Postbox" and "Outlook.com" for several years and I haven't changed anything on my end. About two weeks ago, I started having problems. Now, when I put a single name or a group list into the Bcc field on my "Postbox" desktop email client and send that email through my outgoing SMTP server at "Outlook.com", the email goes through "Outlook.com" and "Outlook.com" moves all the names from the Bcc field to the TO field. I am assuming this has something to do with the new changes associated with the updated "Outlook.com/Outlook Mail" web mail process.

Notes:

When I do the same thing using "Gmail" for my outgoing SMTP server, my names stay in the Bcc field as they should.
My Outlook.com web page now shows Outlook Mail in the top left corner.
I am using imap-mail.outlook.com Port 993 and smtp-mail.outlook.com Port 587 for my servers. I tried switching to imap-mail.live.com and smtp-mail.live.com as one MS web site suggested regarding the new changes to Outlook Mail but those new setting would not connect.
I tried using Mozilla Thunderbird instead of Postbox as my desktop email client and the same problem occurred in that the name in my outgoing Bcc field was put into the To field after the email was processed through Outlook.com.
Based on all of the above, I believe the problem has something to do with the way the new Outlook Mail is trying to process names from the Bcc field in emails sent from my desktop email clients.

I hope someone from MS can look into this problem and get back to us.

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

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Anonymous

Thank you for the thorough feedback Laurel. The post-mortem investigation (as we call it) into the support escalation is underway.

Glad that the fix has reached you. For John and everyone else, the fix has reached about 75% of servers now. There will be a long tail of stragglers but we are working to reach 100% by the end of next week.

Regards,

Sean

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50 additional answers

Anonymous

2016-11-04T18:03:29+00:00

I still have this problem today 4th November 2016. I note that in one of the posts a maximum number of recipients is mentioned. What is that maximum? I am trying to send to 2 groups, one of 148 recipients, and one of 30 without success. I keep getting "error please try later".
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Anonymous

2016-11-03T13:18:29+00:00

Hi again Sean,

Please accept my apologies if I wasn't clear; I wasn't actually trying to report a further bug or fault - all I was trying to point out was that the behaviour of the system prior to Microsoft introducing the bug and how the system behaves now that the bug has been fixed are, in fact, different. Both are acceptable behaviours provided you know that there is the difference - as I say, I was just pointing out that there is a difference. Should you want me to expand on that (either in another thread or this one) just ask and I shall. In the meantime though, thanks again for getting this bug cured.

Best regards

John
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Anonymous

2016-11-03T01:05:08+00:00

Hi John,

We are unable to duplicate this issue and does not seem closely related to the issue we fixed.

Can I please ask you to start a new post on this issue giving a more detailed explanation including the client you are using etc and we will try to figure out why you are receiving that additional email. We can see if others have the problem more easily with a new post as well and you can share the link here.

Regards,

Sean
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Anonymous

2016-11-02T11:39:06+00:00

Hi all,

I'm now glad to report that I have just run a test and the bug appears fixed and everything is now working for me as it should be with my 'hotmail.co.uk' e-address. However, just as a small point of interest, it no longer works exactly as it did before the (putative) 'upgrade'.

Prior to the upgrade if I sent a mail to 'x' bcc e-addresses (and included no 'to' or 'cc' e-addresses) 'x' mails would be sent. However, after the upgrade and now the bug fix, 'x+1' mails are sent; the additional (unasked for) mail being an 'echo' coming back to my Hotmail inbox. Given that there is a (very annoying) restriction on how many addressees one can include in an individual mail and also a (much less annoying, because it is understandable) higher numbered restriction on how many addressees to whom one can send in a day, I wonder if this extra mail is included in those totals. Does anybody (e.g. Sean) know?

Best

John
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