I-Thunderbird Community Forum

Messages I attempt to send to my correspondent are blocked by ABL and I receive the following message from the system: This message was created automatically by mail delivery software.

Sorry, the message you're trying to send cannot be delivered to one or more recipients. The address may be invalid or mistyped. Please view the error below:

<dougjorg@ihug.com.au>: 550 - Policy-MFRM56: IP [103.250.212.14] is currently blocked by the ABL

Reporting-MTA: dns; mail-16-r90.ipv4.syd02.ds.network Received-from-MTA: dns; cp-wc34.syd02.ds.network (122.201.124.175) Arrival-Date: Wed, 25 Mar 2026 17:31:47 +0800 X-Original-ID: 71b3e4e9-282d-11f1-90a5-d094665788dc

Final-Recipient: rfc822; dougjorg@ihug.com.au Action: failed Status: 5.7.1 Remote-MTA: dns; mx-10.au-east.atmailcloud.com (52.65.162.33) Diagnostic-Code: smtp; 550 5.7.1 - Policy-MFRM56: IP [103.250.212.14] is

currently blocked by the ABL (in reply to MAIL command)

Received: from cp-wc34.syd02.ds.network (cp-wc34.syd02.ds.network [122.201.124.175]) by halon-out02.au.ds.network (Halon) with ESMTPS id 71b3e4e9-282d-11f1-90a5-d094665788dc; Wed, 25 Mar 2026 17:31:47 +0800 (AWST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=theorchidmart.com; s=default; h=Subject:From:To:MIME-Version:Date: Message-ID:Content-Type:Sender:Reply-To:Cc:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=HXRD6htWDxNSN7fZRKToybDQ9hr3EVuDMNtdFdD8QCA=; b=Mqd1c7I/wjIq742IOlHLkP6Xot snq5FHg6/Qvwggzmct4A6Eku0Bt0+SJTBDy4QEnA5CZWTU1MvNZIDtnb9MEQNehF+fkqkmJPheEbU ayVwXmZShQQ1zy2zXbXQpIHgZyC/HJ53BXYLMCDy0YYgotCUdWV4bvrf5ZoWSBIiRmY8+s43uFQU6 xF03xE0yzbDsU+tGkFgc7UPqgITi8t0bAVIiW5BgEPxGETNtvB7WAHkpKnnr5yDTRv4OVWf/Hw4Pl Z0xV0IA6vcuzmRsle1GHVdh0vUsMWq8rgj6HBB2CRouOrfJYwbVSsBAi+c+Dd7LBzCt9ct5FQ1RR7 aq1p3fxg==; Received: from [2001:8003:c012:bf00:65d7:80d2:4aca:d3fd] (port=50470) by cp-wc34.syd02.ds.network with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.96.2) (envelope-from <roy@theorchidmart.com>) id 1w5KaZ-004K05-03 for dougjorg@ihug.com.au; Wed, 25 Mar 2026 20:31:47 +1100 Content-Type: multipart/alternative;

boundary="------------UgF3eNHWs59wnccDYNkQVDtA"

Message-ID: <736e9fe8-ccb9-43de-b3b1-94d794835dbf@theorchidmart.com> Date: Wed, 25 Mar 2026 20:31:46 +1100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: Doug Jorgensen <dougjorg@ihug.com.au> From: Roy McCulloch <roy@theorchidmart.com> Subject: TEST X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - cp-wc34.syd02.ds.network X-AntiAbuse: Original Domain - ihug.com.au X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - theorchidmart.com X-Get-Message-Sender-Via: cp-wc34.syd02.ds.network: authenticated_id: roy@theorchidmart.com X-Authenticated-Sender: cp-wc34.syd02.ds.network: roy@theorchidmart.com X-Source: X-Source-Args: X-Source-Dir:

How can this be fixed?

Is there an app or an add-on that I can add to my emailing system that informed me that the person has received the email and then that the email has been opened. A system that will not require the person receiving the email to actually accept and all send the read request

good day

we are struggling for the past two days to send emails . constantly getting the same error

Sending message failed

Failed to send message.

The message could not be sent because the connection to the SMTP server smtp.golf-south-africa.com has exceeded its expiration timeout. Try again.

PLEASE urgently help me. Thank you

Good Afternoon Theres 2 accounts under the same username.One is working fine and the other one displays the error notification "Failed to connect to server mackie. when I press on inbox. What confuses me is that it has the same names but has different folders underneath it.I need the one that displays the error messages to be fixed.

This month I downloaded the current version of Tbird on a new computer running windows 11. Tbird receives all my email but can not send mail. I have an old computer running on windows 7 which has Tbird that was loaded at least 5 years ago. It receives and sends email without problems. The two versions of Tbird are using the same SMTP settings: server: mail.twc.com Port: 587. My email account for Tbird is slengyel@triad.rr.com

I also have a gmail account which receives and sends on both computers without problems. My gmail account is steve.lengyel9@gmail.com.

Both computers run through the same internet network.

I had Mozilla which I accidentally deleted a couple of years ago. Spectrum serviced my email, dmarsh38@roadrunner.com, since then but now has abruptly cut that off. I'm wondering if Thunderbird will resume servicing this email, and how do I make that happen, how do I access it, etc.? I'm trying to avoid having to change my email address of 30 years.

Dear Customer Service,

I forward many emails to my wife or our friends and end my comments at the beginning of the actual message with a signature switch and an underline. Unfortunately, the signature is not inserted in front of the message to be sent, but at the very end. If the message to be sent is several pages long, you cannot see the signature text at all, and it took me several attempts to find it at the end of the many pages. I find this very annoying!

Kind regards

Ulf D. Meyer

I didn't know I had a Mozilla account. Should I create one? Download Firefox? I've relied on my Thunderbird e-mail program for decades. When my Google password changes it is always tricky to get Thunderbird to talk to Gmail. But I don't ever remember being asked for a primary password again. Looking through the "articles", I'm not sure they are talking about e-mail or web browsers. "The imap server imap.gmail.com does not support the selected authentication method. Please change the authentication method." I am using OAuth2 as my authentication method. I tried entering my Google password early Saturday and it started receiving mail again. I was ecstatic. But it didn't last! It broke down again. Please help. I've donated a lot of money to Thunderbird.

I am experiencing persistent issues configuring a custom-domain email account in Mozilla Thunderbird, while the same account works correctly in Outlook and in webmail.

Environment:

Email client: Mozilla Thunderbird (latest version)

OS: Windows

Mail hosting: Antagonist / DirectAdmin (shared hosting)

Domain: s23k.com

Email address: jean-paul.sablerolle@s23k.com

Incoming mail (POP):

Server: mail.s23k.com

Port: 995

Security: SSL/TLS

Authentication: normal password POP connection works without errors.

Outgoing mail (SMTP):

Server: mail.s23k.com

Ports tested: 465 (SSL/TLS), 587 (STARTTLS)

Thunderbird fails to send mail with the error:

“The requested domain name does not match the server’s certificate.”

Even after explicitly adding and permanently accepting the certificate exception, Thunderbird continues to reject the connection.

Important observations:

Webmail (Roundcube) can send mail successfully.

Microsoft Outlook can send mail successfully using the same SMTP server.

Thunderbird never completes SMTP authentication because the TLS handshake fails on hostname validation.

The certificate presented by the server appears to be issued for a different hostname than mail.s23k.com.

As a workaround, I am currently using an external SMTP server (KPN: smtp.kpnmail.nl), which works correctly in Thunderbird.

Question: Is Thunderbird intentionally stricter than Outlook regarding TLS hostname validation for SMTP, and is there any supported way to:

properly override this hostname mismatch for SMTP, or

diagnose whether this behavior is expected and unavoidable with misconfigured server certificates?

I would like to confirm whether this is expected Thunderbird behavior or if there is a configuration option I may have missed.

I am not trying to weaken security; I want to understand whether Thunderbird allows any safe override in this scenario or if the server configuration is fundamentally incompatible.

I solved my problem.

I "Tools / Account Settings" / "Copies & Folders" unchecked & checked "Place a copy in:" and this solved my problem. Something became disconnected is someway.