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Release 140.4.0esr blocks email send

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  • Last reply by Matt

hhc38
hhc38
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Dear community members, Since receiving the Thurderbird release 140.4.0esr on Oct 14th, I have not been able to send email from any of my accounts (2xIMAP and 3xoffice365 through OWL). Nothing has changed in the account settings. Receive works ok. The usual easy fixes do not seem to work (restart, firewall switch-off, etc.). Any ideas beyond having to rewind to an earlier version and rebuild the whole thing (hopefully not!)?

Version 140.4.0esr Build ID 20251010020716 User Agent Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:140.0) Gecko/20100101 Thunderbird/140.4.0 OS Darwin 24.6.0 Darwin Kernel Version 24.6.0: Mon Jul 14 11:30:30 PDT 2025; root:xnu-11417.140.69~1/RELEASE_ARM64_T6020

Thank you for your help! Heli

Dear community members, Since receiving the Thurderbird release 140.4.0esr on Oct 14th, I have not been able to send email from any of my accounts (2xIMAP and 3xoffice365 through OWL). Nothing has changed in the account settings. Receive works ok. The usual easy fixes do not seem to work (restart, firewall switch-off, etc.). Any ideas beyond having to rewind to an earlier version and rebuild the whole thing (hopefully not!)? Version 140.4.0esr Build ID 20251010020716 User Agent Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:140.0) Gecko/20100101 Thunderbird/140.4.0 OS Darwin 24.6.0 Darwin Kernel Version 24.6.0: Mon Jul 14 11:30:30 PDT 2025; root:xnu-11417.140.69~1/RELEASE_ARM64_T6020 Thank you for your help! Heli

All Replies (4)

Matt
Matt
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See https://support.mozilla.org/en-US/kb/cannot-send-messages

hhc38
hhc38 Question owner
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Thank you Matt. I had been through these steps with no luck. The SMTP settings are correct, I've tried switching firewall, antivirus etc. off, the TLS protocols are ok. None of my five email accounts send let anything out. Every message gets stuck as soon as hit send.

It seems the problem occurs before the message even reach the server since Mozilla does not offer me the spell check or address check on those accounts in which I have switched these functions on. There is no error message, the sending just stops. The message to be sent stays on the screen with no activity but can luckily be copied and closed so the whole programme is not frozen.

Heli

hhc38
hhc38 Question owner
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With no further responses to my query, it sounds like I have no choice but to rebuild the system? Heli

Matt
Matt
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You could log the connection, but my personal bug bear of antivirus interference would be my guess based on the information presented, despite you thinking you have tried disabling it. Norton at least says you have it if, but it still manages to hang in there.

Thunderbird updated everything stopped and no error messages at all. That sounds like an antivirus failure. See https://wiki.mozilla.org/MailNews:Logging#Thunderbird_Logging for logging of the SMTP process.

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