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Sent Items Folder Duplicates (NOT the same issue that I see everyone else has)

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FIRST) please note that this is NOT the same issue that I see actual answers to online, the solution to that problem is to simply turn off the option to create a copy of sent items and store them in a specific place.

We use Office365 (Exchange Online) for our email service. I am using Thunderbird via IMAP as a front-end on my local machine.

PLEASE NOTE that this JUST started happening in the past two business days. I've had the exact same setup on the same machine for several months now, nothing has changed at all in regards to settings. This is the first time I've experienced this behavior since I started using the program.

The specific problem: I am now getting duplicates of MOST of the emails in my "Sent Items" folder. But not all emails, some of the time this does not happen. And I can't tell a pattern as to which emails aren't being included in the Sent Items folder and which are not.

I just noticed in fact, that the emails aren't showing up in my "Sent Items" folder even on Outlook Online, which I simply don't understand, because all of my emails are going out through this server so I don't understand how the emails can go out but not see any evidence of this anywhere.

Example, I just sent two test emails, after turning OFF the option to save a copy of sent items, one email was sent to an individual client, outside of this office and at another domain. The second email was sent to a local "distribution" email address here at my domain (an email address that delivers to multiple people). I am on the distro list, so I can verify the email was received. And I verified with my client that the email I sent her was received. BUT, neither of these emails show up in my "Sent Items" folder, anywhere, not even online at Office365. I simply am not able to find any evidence ANYWHERE that these emails were sent out by me.

Can anyone offer any assistance as to how to address this issue? Or perhaps even help me understand WHY or what is going on? The only solution I see at this time is to leave the option to save copies turned on, and just put up with the duplicates. I simply can't afford to "lose" certain emails that I've sent because they're not copying over to the Sent Items folder. . . .

Please help!?!?!?!?!?!?!

Thanks, Greg

FIRST) please note that this is NOT the same issue that I see actual answers to online, the solution to that problem is to simply turn off the option to create a copy of sent items and store them in a specific place. We use Office365 (Exchange Online) for our email service. I am using Thunderbird via IMAP as a front-end on my local machine. PLEASE NOTE that this JUST started happening in the past two business days. I've had the exact same setup on the same machine for several months now, nothing has changed at all in regards to settings. This is the first time I've experienced this behavior since I started using the program. The specific problem: I am now getting duplicates of MOST of the emails in my "Sent Items" folder. But not all emails, some of the time this does not happen. And I can't tell a pattern as to which emails aren't being included in the Sent Items folder and which are not. I just noticed in fact, that the emails aren't showing up in my "Sent Items" folder even on Outlook Online, which I simply don't understand, because all of my emails are going out through this server so I don't understand how the emails can go out but not see any evidence of this anywhere. Example, I just sent two test emails, after turning OFF the option to save a copy of sent items, one email was sent to an individual client, outside of this office and at another domain. The second email was sent to a local "distribution" email address here at my domain (an email address that delivers to multiple people). I am on the distro list, so I can verify the email was received. And I verified with my client that the email I sent her was received. BUT, neither of these emails show up in my "Sent Items" folder, anywhere, not even online at Office365. I simply am not able to find any evidence ANYWHERE that these emails were sent out by me. Can anyone offer any assistance as to how to address this issue? Or perhaps even help me understand WHY or what is going on? The only solution I see at this time is to leave the option to save copies turned on, and just put up with the duplicates. I simply can't afford to "lose" certain emails that I've sent because they're not copying over to the Sent Items folder. . . . Please help!?!?!?!?!?!?! Thanks, Greg

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The information I have is that outlook.com and Gmail make a copy as the email traverses their SMTP server. I have seen nothing specific to Office365. Given it is only exchange server, I am assuming it does not do the silly copying given it would cause huge problems in business environments where consultants suggest most users have trouble with the coffee cup holders still. And receptionists that boil the kettle and trip the server circuit because it is closer than the tea room are not uncommon.

So we are starting from an unknown.

Another unknown is what outgoing server is actually being used when you send mail? Thunderbird can have many configured and some still use ISP SMTP server when they should not be.

Have a look in the outgoing server (SMTP) entry in account settings click the > next to options on the applications menu. How many do you have? Are they all O365 accounts?

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Thanks for the reply Matt! I should have addressed this question in the original post, I have only one SMTP server set up. Mine is an extremely basic setup, I only have one mail account set up in Thunderbird. I'm not using multiple accounts or inboxes, nor do I have any other servers set up, incoming or outgoing. I've attached an image of my current outgoing setup.

Another thing I want to reiterate, I've been using this exact same setup for months now, without issue. It's only the past couple of business days, literally, that I've noticed this. I first noticed the issue Friday of last week. Prior to that, this was not happening. I have changed NOTHING on my end. I certainly haven't changed any of the Thunderbird settings and I also have not noticed Thunderbird update itself during this time.