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With just 2 email addresses that I have been using for years, I suddenly get this Undeliverable message when attempting to send emails using Thunderbird:

"The mail client submitted this message with bare line feeds, which cannot be sent via SMTP protocol DATA command and receiving system does not support BDAT"

I can receive emails from the 2 addresses fine, I just can't send to them through Thunderbird. When I sign in to Hotmail Outlook Live I can send and receive to these addresses with no problem.

I'm stumped! Any ideas? Can I reset Thunderbird?

Thanks

I had already post this problem recently, but in spite of Thunderbird already had two interim point releases 102.1.1 and today's 101.1.2, this problem remains.

This situation did not occur in older versions, and I cannot use pop3 access to AOL email account with "normal password" (encrypted). For the time being, I am accessing AOL web mail using Firefox.

I tried unsuccessfully all other authentication methods, so no authentication method is working with AOL.

This is the Thunderrbird error I get when using OAuth2 authentication method:

"The server does not support the selected authentication method. Please change the 'Authentication method' in the 'Account Settings | Server settings".

It is not true, AOL does support the OAuth2 authentication method.

I have been using Thunderbird as my default email for years and have run into my share of issues. Out of nowhere, starting this morning, I am unable to send emails from Thunderbird at all. I spent about 2 hours on the phone with my service provider trying to figure it out. The unfortunate conclusion I have come to, is that unless you can fix this issue for me, I will be using Outlook going forward. Let me be clear, I HATE OUTLOOK! but I am running out of options other than to throw away the email address I have been using since about 1990.

This is the message I get when the email does not send. This particular one was to trs.ky.gov, but it doesn't matter who the recipient is, the only ones that don't get this message are those I send to myself.

Your message contains invalid characters (bare line feed characters) which the email servers at trs.ky.gov don't support. reb Office 365 julie.soard Action Required Recipient

Bare line feeds unsupported

How to Fix It It appears that your email program added invalid characters (bare line feed characters) into your message when you sent it. Try using a different email program to send your message. If the problem continues send this non-delivery report (NDR) message to your email admin for assistance.

Was this helpful? Send feedback to Microsoft.

More Info for Email Admins Status code: 550 5.6.11

This error occurs when the email program or device used to create or send an email message adds bare line feed characters into the message. When bare line feed characters are included in a message, the SMTP protocol chunking feature is required to transmit the message between email servers. Chunking uses the SMTP protocol BDAT command, but the recipient's email server doesn't support the BDAT command.

To fix the issue, the sender should send the message using an email program or device that doesn't add bare line feed characters to messages. Most modern email programs don't add bare line feed characters.

If the sender is using a device like a fax machine, printer, or scanner, it's likely an older model that doesn't support the SMTP protocol BDAT command. To fix this error, you'll need to replace the device with a newer model that supports the BDAT command. The industry standard recommendation to support SMTP chunking was published in 1998 so most devices manufactured during the last decade support this feature.

Another option is for the email admin at the recipient's domain to upgrade their email servers to servers that support the SMTP protocol BDAT command. Most modern email servers support BDAT; however, some free and older email servers don't support it.

For more information see Fix email delivery issues for error code 5.6.11 in Office 365.

Original Message Details Created Date: 8/2/2022 9:35:48 PM Sender Address: reb@isoc.net Recipient Address: julie.soard@trs.ky.gov Subject: Fwd: documents for retirement

Error Details Reported error: 550 5.6.11 SMTPSEND.BareLinefeedsAreIllegal; message contains bare linefeeds, which cannot be sent via DATA and receiving system does not support BDAT DSN generated by: SN6PR08MB5327.namprd08.prod.outlook.com

I cannot make calls via Firefox on Facebook Messenger. In the second window that normally loads tells me that something went wrong. (in Dutch tells me "Er is iets fout gegaan" This happens on both my computers, Windows and Linux. Even when I start Firefox in troubleshoot mode it is still not working. However works absolute perfectly in Google Chrome. The problem started today by my knowledge for no apparent reason. I tested the camera in Firefox, works. I tested the microphone in Firefox, works, no problem. Also I granted Facebook permission to use the microphone and camera.

Thunderbird 102.1.0 (32-bit) is suddenly giving me error messages but only to a few recipients. " Your message to rebeccaleahrogers@yahoo.com couldn't be delivered. Your message contains invalid characters (bare line feed characters) which the email servers at yahoo.com don't support. dave Office 365 rebeccaleahrogers Action Required Recipient

Bare line feeds unsupported

How to Fix It It appears that your email program added invalid characters (bare line feed characters) into your message when you sent it. Try using a different email program to send your message. If the problem continues send this non-delivery report (NDR) message to your email admin for assistance.

Was this helpful? Send feedback to Microsoft.

More Info for Email Admins Status code: 550 5.6.11

This error occurs when the email program or device used to create or send an email message adds bare line feed characters into the message. When bare line feed characters are included in a message, the SMTP protocol chunking feature is required to transmit the message between email servers. Chunking uses the SMTP protocol BDAT command, but the recipient's email server doesn't support the BDAT command.

To fix the issue, the sender should send the message using an email program or device that doesn't add bare line feed characters to messages. Most modern email programs don't add bare line feed characters.

If the sender is using a device like a fax machine, printer, or scanner, it's likely an older model that doesn't support the SMTP protocol BDAT command. To fix this error, you'll need to replace the device with a newer model that supports the BDAT command. The industry standard recommendation to support SMTP chunking was published in 1998 so most devices manufactured during the last decade support this feature.

Another option is for the email admin at the recipient's domain to upgrade their email servers to servers that support the SMTP protocol BDAT command. Most modern email servers support BDAT; however, some free and older email servers don't support it."

I use GoDaddy.com as my ISP provider and they have ported all the accounts over to MS Outlook. It worked fine last week, and suddenly I'm getting this "Illegal characters" message. Any hints?

Yesterday I downloaded and installed 103.0.0 Went to a website to view a rumble video, display driver crashed, had to restart computer. Today I checked for new version saw 103.0.1. Downloaded & installed it, tried same websites as yesterday, 3 in total, same problem.

Am using win7PRO, updated until Bill quit stopped supporting it. Have had NO problems with other vid platforms.......

I cant connect to face book messenger i get this message: Something went wrong

Try restarting Firefox or restarting your computer. For more troubleshooting suggestions, visit our Help Center.

If the issue persists please let us know. Report an issue.

I have a filter to mark certain messages as read upon arrival (through Tools => Message Filters). This used to work fine until the last major upgrade of Thunderbird. Now the messages do get marked as read, but I am still getting a taskbar notification for a new message, which defeats the purpose of not being alerted to these messages.

Is there a fix or a way around this? I just need 'not to be notified about certain messages', something that used to be achieved by marking them as read automatically, but that doesn't work anymore.

v102.1.2 (64-bit) on Windows 10

Thanks for any help! Gigi

After upgrading to Thunderbird 102.1.1 - Remote Server returned '550 5.6.11 SMTPSEND.BareLinefeedsAreIllegal; message contains bare linefeeds, which cannot be sent via DATA and receiving system does not support BDAT' appears in returned message upon bounce. All suggestions found online recommend having recipients make changes to accept badly formed messages. We view that as totally impractical. We tried downgrading, but the only result was to lose the profiles. Now, end user is frantic. Please advise. Thank you, Fred

Hi All,

Until yesterday(5 Aug 22) my Thunderbird with Office365 account was working fine. Suddenly from today, it started asking password and my correct password is not going through. I searched internet and found that it has something to do with Microsoft's updates on security.

I am attaching the error message. Is anybody facing the problem? How to solve this problem.

Thanks in advance

Firefox just locks up. The mouse cursor can be used to resize the window, but is otherwise unresponsive, except to to minimize, maximize or close the window. If I click minimize and then restore the window, Firefox will have executed the last mouse-click before minimizing. This happens after five minutes or so after starting Firefox, whether I have only 4 or 5 tabs open, or a whole pile of tabs. All I can do is click X in top RHS, and then restart Firefox. Then click the "recently closed tabs" to get back to where I was. I have tried clearing the cache and (most of) the cookies. As well I did a complete refresh of Firefox, and disabled all the add-ons, but the problem is still there Running on a (old) Lenovo Thinkpad E545 with 16GB, Ubuntu in a SSD using a 50 GB partn with 30GB free. This problem occurs only in Firefox- all other apps continue to run!

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Following the Thunderbird update to version 102, the calendar sync with Outlook.com seems no longer possible. This synchronisation was ensured by installing the two Add-ons: Provider for Exchange ActiveSync + TbSync. Both these Add-ons are now de-activated by Thunderbird since no more compatible with ver 102. Is any solution available to sync my calendar in Outlook.com with Thunderbird ver 102 ?

I have, very reluctantly, had to stop using Windows Live Mail, because gmail will no longer support it. It was a great email program and it did everything I needed. Thunderbird would seem to be the nearest thing I can find to replace Live Mail - but there seems to be some quite staggering basic functions that are missing from it. Maybe I'm alone in wanting to include a picture or two in my emails..? - not as attachments, but as part of 'the visual letter', within the text? Live Mail must be 20 years old at least - but in Live Mail I could insert an image; drag the corners to resize it; add a box rule if I wanted to; and send it on it's way. In 21stC Thunderbird I can, with many a dialogue box, insert an image... but even when I've worked out how to 'resize it', it doesn't actually reduce the file size of the image sent..! So a 7MB image, when 'resized' to something less than 1MB... still actually gets transmitted as a 7MB image - and takes forever! So my question is. How come an ancient, now almost defunct program like Live Mail, is twenty times more agile and user-friendly than 'up-to-date' Thunderbird? And before anyone mentions 'add-ons' - Live Mail did all of this straight out of the box! No 'add-on' searching or anything else required. But maybe including a picture or two in an email is a fairly revolutionary concept? With thanks for your thoughts.

I've been using Thunderbird for a long long time and have always had many imap accounts setup, including a Yahoo Mail account.

As of just the other day (I believe Tues, June 7, 2022), suddenly and unexpectedly, Thunderbird 91.10.0 (64-bit) began showing ALL of my mail folders in the Yahoo account on the server, when I have always had many folders hidden (in unsubscribed state).

I have Thunderbird installed on 4 computers, and, as I launched TB on each of them, the displayed Yahoo folders updated to all folders on each computer (I had originally set up my profile on one computer and then later copied it to each of the others).

When I go into the TB yahoo account settings to re-unsubscribe and apply the settings and then restart TB, all folders remain showing... I cannot seem to get TB to once again unsubscribe to the folders I'm not interested in seeing in TB.

For reference, other imap accounts I have configured in the same profile remain with the same subscribed/unsubscribed settings I've always had.

If anyone has any ideas or explanations or a recommended fix, I'm all ears! ty!

I have Firefox 100.0.1 on my Mac desktop, and Firefox 100.0 on my MacBook Pro laptop. I can no longer access my Microsoft OneDrive account via the web on my desktop, but I still can do so on my laptop. I have gone through your posted troubleshooting steps for Firefox on my desktop, to no avail. How do I get my desktop back to version 100.0 so it will work again? I can access my OneDrive account via the web on my desktop when I use the Safari browser, so the issue is definitely with Firefox version 100.0.1, and not with my desktop.