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Why is my connection to outgoing server (SMTP) timing out?

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For the past several days, I've received the "Send Message Error" about the "The message could not be sent because the connection to Outgoing server (SMTP) ... timed out. Try again." (I can try again all day, but the problem persists.)

This happens only when replying to or trying to forward a longer message (particularly one with images or attachments, apparently). I have no trouble sending a simple text message of a few words. And all incoming messages, or whatever size or complexity, are arriving just fine.

I haven't made any changes to SMTP (or any other settings) in recent days. I use Bitdefender, but I have it set to only scan incoming messages. I'm using Thunderbird 60.7.1 (just updated today, but problem existed with 60.7.0) on a Windows 7 computer.

This is a big problem. Any advice would be welcomed.

For the past several days, I've received the "Send Message Error" about the "The message could not be sent because the connection to Outgoing server (SMTP) ... timed out. Try again." (I can try again all day, but the problem persists.) This happens only when replying to or trying to forward a longer message (particularly one with images or attachments, apparently). I have no trouble sending a simple text message of a few words. And all incoming messages, or whatever size or complexity, are arriving just fine. I haven't made any changes to SMTP (or any other settings) in recent days. I use Bitdefender, but I have it set to only scan incoming messages. I'm using Thunderbird 60.7.1 (just updated today, but problem existed with 60.7.0) on a Windows 7 computer. This is a big problem. Any advice would be welcomed.
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Matt
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Probably bit defender being slow in it's scanning of the temp folder where the mail is "assembled"

Try running the disk cleanup utility what comes with windows or do a manual cleanup of the folder

Probably bit defender being slow in it's scanning of the temp folder where the mail is "assembled" Try running the disk cleanup utility what comes with windows or do a manual cleanup of the folder
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Unlikely -- I formerly had Bitdefender only looking at incoming emails, but for this problem I also tried having Bitdefender ignore ALL email. No help.

Another thing I tried (also to no avail): Increasing the timeout time in mailnews.tcptimeout from 100 to 200.

I'm really stumped on this one. But it's an occasional big problem because, some times, I absolutely have to be able to respond to or forward emails with embedded images or attachments.

Unlikely -- I formerly had Bitdefender only looking at incoming emails, but for this problem I also tried having Bitdefender ignore ALL email. No help. Another thing I tried (also to no avail): Increasing the timeout time in mailnews.tcptimeout from 100 to 200. I'm really stumped on this one. But it's an occasional big problem because, some times, I absolutely have to be able to respond to or forward emails with embedded images or attachments.
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Matt
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K2nc2016 said

Unlikely -- I formerly had Bitdefender only looking at incoming emails, but for this problem I also tried having Bitdefender ignore ALL email. No help.

Why not? I talked about the temp folder. what goes on there has nothing to do with email scanning. Just general windows garbage collection being rubbish in itself and bitdefender being a slug.

But I will let you get there by yourself.

To diagnose problems with Thunderbird, try one of the following:

  • Restart Thunderbird with add-ons disabled (Thunderbird Safe Mode). On the Help menu, click on "Restart with Add-ons Disabled". If Thunderbird works like normal, there is an Add-on or Theme interfering with normal operations. You will need to re-enable add-ons one at a time until you locate the offender.
  • Restart the operating system in safe mode with Networking. This loads only the very basics needed to start your computer while enabling an Internet connection. Click on your operating system for instructions on how to start in safe mode: Windows 10, Windows 8, Windows 7, Windows Vista, Windows XP, OSX
If safe mode for the operating system fixes the issue, there's other software in your computer that's causing problems. Possibilities include but not limited to: AV scanning, virus/malware, background downloads such as program updates.
''K2nc2016 [[#answer-1230497|said]]'' <blockquote> Unlikely -- I formerly had Bitdefender only looking at incoming emails, but for this problem I also tried having Bitdefender ignore ALL email. No help. </blockquote> Why not? I talked about the temp folder. what goes on there has nothing to do with email scanning. Just general windows garbage collection being rubbish in itself and bitdefender being a slug. But I will let you get there by yourself. To diagnose problems with Thunderbird, try one of the following: *Restart Thunderbird with add-ons disabled (Thunderbird Safe Mode). On the Help menu, click on "Restart with Add-ons Disabled". If Thunderbird works like normal, there is an Add-on or Theme interfering with normal operations. You will need to re-enable add-ons one at a time until you locate the offender. *Restart the operating system in '''[http://en.wikipedia.org/wiki/Safe_mode safe mode with Networking]'''. This loads only the very basics needed to start your computer while enabling an Internet connection. Click on your operating system for instructions on how to start in safe mode: [https://support.microsoft.com/en-us/help/12376/windows-10-start-your-pc-in-safe-mode Windows 10], [http://windows.microsoft.com/en-us/windows-8/windows-startup-settings-safe-mode Windows 8], [http://windows.microsoft.com/en-us/windows/start-computer-safe-mode#start-computer-safe-mode=windows-7 Windows 7], [http://windows.microsoft.com/en-us/windows/start-computer-safe-mode#start-computer-safe-mode=windows-vista Windows Vista], [http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/boot_failsafe.mspx?mfr=true" Windows XP], [http://support.apple.com/kb/ht1564 OSX] ; If safe mode for the operating system fixes the issue, there's other software in your computer that's causing problems. Possibilities include but not limited to: AV scanning, virus/malware, background downloads such as program updates.
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Which port is your SMTP server using? I've had similar issues using the port 465 (SMTPS, or SSL) Have you tried port 587 (START TLS)? I've had better results with this last one.

HTH,

Pedro.

Which port is your SMTP server using? I've had similar issues using the port 465 (SMTPS, or SSL) Have you tried port 587 (START TLS)? I've had better results with this last one. HTH, Pedro.
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I'm using port 587.

This is the port I've always used, from way back when until this timeout problem started recently. So that's almost certainly not the source of the problem.

I'm using port 587. This is the port I've always used, from way back when until this timeout problem started recently. So that's almost certainly not the source of the problem.
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Matt--

Nope.

Clearing the TEMP folder (which I do once or twice a month anyhow, 'cause I like a tidy computer) did nothing. Yesterday, and again today, restarting in Thunderbird Safe Mode (and after a warm boot and a cold boot one time each) did nothing. Restarting Windows 7 in Safe Mode with Networking did nothing. Restarting regularly, but with Bitdefender completely turned off, did nothing.

Something happened to/on my computer recently that caused this, because all my email settings from long ago remain unchanged. And I'm at my wit's end -- but reminded me of something that sounds quite similar albeit from a few years ago: http://forums.mozillazine.org/viewtopic.php?f=39&t=2982671.

(BTW: I use Thunderbird with my legacy Time Warner account through my ISP Spectrum. It would not surprise me to learn they've recently changed something, SMTP-wise, but their support people deny that. I just don't know ...)

Matt-- Nope. Clearing the TEMP folder (which I do once or twice a month anyhow, 'cause I like a tidy computer) did nothing. Yesterday, and again today, restarting in Thunderbird Safe Mode (and after a warm boot and a cold boot one time each) did nothing. Restarting Windows 7 in Safe Mode with Networking did nothing. Restarting regularly, but with Bitdefender completely turned off, did nothing. Something happened to/on my computer recently that caused this, because all my email settings from long ago remain unchanged. And I'm at my wit's end -- but reminded me of something that sounds quite similar albeit from a few years ago: http://forums.mozillazine.org/viewtopic.php?f=39&t=2982671. (BTW: I use Thunderbird with my legacy Time Warner account through my ISP Spectrum. It would not surprise me to learn they've recently changed something, SMTP-wise, but their support people deny that. I just don't know ...)
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