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Thunderbird (latest) smtp timeout large emails

  • 2 replies
  • 1 has this problem
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  • Last reply by peter441

peter441
peter441
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I run a mail server here (VPOP3 as it happens). I have recently changed the HW it runs on to a Win 10 (yeuch!) NUK. All mail works fine except when I try sending emails through it from Thunderbird (latest - 78.6.1 (32-bit)) from a Win 7 (64 bit ) PC. Simple emails or ones with small attachments go fine but over about 200k they timeout. My suspicion is that Micro$oft's Antimalware service is hogging too much of the CPU on the mail sever PC and the send is timing out part way through. I have throttled it back as much as poss with the powershell cmd:- Set-MpPreference -ScanAvgCPULoadFactor and it has improved it in as much as I have increased the size of the file that can be sent. Is there a timeout in Thunderbird I can increase so attacking it from the both ends? I have looked (desperately) for the old advance config but it seems to have disappeared. Any help or suggestions gratefully appreciated. I know I _can_ uninstall the anti-malware but would rather not.

I run a mail server here (VPOP3 as it happens). I have recently changed the HW it runs on to a Win 10 (yeuch!) NUK. All mail works fine except when I try sending emails through it from Thunderbird (latest - 78.6.1 (32-bit)) from a Win 7 (64 bit ) PC. Simple emails or ones with small attachments go fine but over about 200k they timeout. My suspicion is that Micro$oft's Antimalware service is hogging too much of the CPU on the mail sever PC and the send is timing out part way through. I have throttled it back as much as poss with the powershell cmd:- Set-MpPreference -ScanAvgCPULoadFactor and it has improved it in as much as I have increased the size of the file that can be sent. Is there a timeout in Thunderbird I can increase so attacking it from the both ends? I have looked (desperately) for the old advance config but it seems to have disappeared. Any help or suggestions gratefully appreciated. I know I _can_ uninstall the anti-malware but would rather not.

Chosen solution

Thanks for getting back so soon. I tried increasing that (non-intuituive) value and it had no effect. I didn't want to turn off anti-malware so tried to figure out how to disable it temporarily and no joy. In the end I took Micro$not's advice and installed an alternative (AVG). All seems sweetness and light ATM

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sfhowes
sfhowes
  • Top 10 Contributor
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First, try excluding the TB profile folder in Windows Defender or Antimalware settings (unless the former includes the latter). This is the general method to avoid timeouts. If you need to increase the timeout, the preference in Options/General/Indexing/Config. editor is mailnews.tcptimeout.

peter441
peter441 Question owner
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Chosen Solution

Thanks for getting back so soon. I tried increasing that (non-intuituive) value and it had no effect. I didn't want to turn off anti-malware so tried to figure out how to disable it temporarily and no joy. In the end I took Micro$not's advice and installed an alternative (AVG). All seems sweetness and light ATM