I am receiving messages but I can't send messages,no outgoing emails.
bob.fannon Feb 14, 2026, 13:01 CST I have used Thunderbird for a number of years with Plusnet (using POP settings) in the UK. However, Plusnet has transferred their suppo… (read more)
bob.fannon
Feb 14, 2026, 13:01 CST
I have used Thunderbird for a number of years with Plusnet (using POP settings) in the UK. However, Plusnet has transferred their support to a company called Greenby who have made a hash of it and offer very poor support. So, I want to use Outlook as the mail server but I am unable to send any messages via Thunderbird to the Outlook server. I can however download messages with no problems. The error message I get is :- Sending of the message failed. Unable to authenticate to Outgoing server (SMTP) smtp.office365.com. Please check the password and verify the 'Authentication method' in 'Account Settings | Outgoing server (SMTP)'
My default Outgoing Sever settings are :- Server Name : smtp.office365.com Port: 587 User Name: bob.fannon@outlook.com Authentication method: OAuth2 Connection Security: STARTTLS
I have tried deleting the Thunderbird account and re-creating it but still got the same result. I also tried to use my old Icloud account ( having first setup my App Specific password) but got the same result.
I LOST MY EMAIL. HOW DO I GET IT BACK?
Apparently MS has changed something in their OAuth2 and Thunderbird has yet to catch up. I've seen several other questions regarding this, but no workable solutions, just… (read more)
Apparently MS has changed something in their OAuth2 and Thunderbird has yet to catch up. I've seen several other questions regarding this, but no workable solutions, just silly replies. Is TB actively working on a solution or am I now forced to install Outlook?
Hello, I have a secondary email address from which I can no longer send emails. The error code is OFR104_528(528). How can I resolve this, please?
For the past two weeks I have not been able to receive or send email with Thunderbird, what could have happened?
HAVE PROBLEMS WITH MY MAILS; CAN'T OPEN THEM AND FORGOT MY ID NUMBER
I an not able to receive emails or send them?
Thunderbird email send stopped working something like three weeks ago. I am using Fedora 43. What happened to cause this send problem? I had been using Thunderbird for a… (read more)
Thunderbird email send stopped working something like three weeks ago. I am using Fedora 43. What happened to cause this send problem? I had been using Thunderbird for a very long time with no problems. I am using Mozilla Thunderbird 147.0
Thunderbird is not connecting with Xfinity Comcast for sending or receiving emails at gpenkala@comcast.net . This combination was working fine for decades. Last Friday (J… (read more)
Thunderbird is not connecting with Xfinity Comcast for sending or receiving emails at gpenkala@comcast.net . This combination was working fine for decades. Last Friday (Jun 12) was the last email I received in Thunderbird. I can view current emails on the Xfinity website, but these are not being transferred to my Thunderbird account anymore, These are the error messages:
"Sending of the message failed.
Unable to authenticate to Outgoing server (SMTP) smtp.comcast.net. Please check the password and verify the 'Authentication method' in 'Account Settings | Outgoing server (SMTP)'." "Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: resomta-c2p-555483.sys.comcast.net resomta-c2p-555483.sys.comcast.net Excessive failed authentication, ESMTP server temporarily not available."
Can you tell me what configurations I should be using within Thunderbird for Incoming and Outgoing Servers?
My emails are not coming in,
it said the server timed out. been using Thunderbird for years.
Sat down this afternoon and the last email in my box was 10:28 a.m. Why am I not able to send and receive emails?
New to Thunderbird. I have added a Gmail account to Thunderbird. I select a message in Inbox, right click > Move To > Local Folder It seems to work. It creates a co… (read more)
New to Thunderbird.
I have added a Gmail account to Thunderbird. I select a message in Inbox, right click > Move To > Local Folder
It seems to work. It creates a copy in Local Folder.
However, a few seconds later, the message reappears in the Inbox. The message in Local Folder is still there, confirming that copy is made successfully.
Also, the message is still in Gmail account when viewed from Google's Gmail. It's clearly working like Copy rather than Move.
This is frustrating. Is it a bug?
I would like my incoming mail to be placed into the Inbox rather than Trash. How do I make this happen?
Things have suddenly disappeared. My sent file is gone and I have searched and can't find it. Tonight I went to send an email and the tab for doing that is also missing… (read more)
Things have suddenly disappeared. My sent file is gone and I have searched and can't find it. Tonight I went to send an email and the tab for doing that is also missing. I tried uninstalling and reinstalling with no success. What's wrong and how do I fix it?
I do not seem to recceive any emails to xxx@virginmedia.com please help
when i try to get new emails says authentication problem
update to email on 5/19/26 and I am unable to pull new emails past that date. I also get doubles of emails from 5/18 and 5/19
versendete Mail wird nicht im Ordner SentMail angezeigt, wo ist die gesendete Mail?
'URGENT I can receive emails but cannot send emails. Keep getting them back "undeliverable" but they are to my regular email addresses. I have checked and recheck the… (read more)
'URGENT I can receive emails but cannot send emails. Keep getting them back "undeliverable" but they are to my regular email addresses. I have checked and recheck the format for sending they are correct. This occurred around 2nd April As I am making arrangements for a family member's funeral this is an urgent matter.
