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Thunderbird will not connect to email server but did before. All settings are correct for server

  • 19 replies
  • 1 has this problem
  • 1 view
  • Last reply by Matt

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I receive email on 2 iMacs and 2 iPhones. One iMac suddenly stopped connecting to server. All server settings have been checked and double checked. Another user on this particular iMac can access his email from the same server. Other iMac and iPhones work fine. I have removed the account and added automatically AND manually. Any ideas would be appreciated?

I receive email on 2 iMacs and 2 iPhones. One iMac suddenly stopped connecting to server. All server settings have been checked and double checked. Another user on this particular iMac can access his email from the same server. Other iMac and iPhones work fine. I have removed the account and added automatically AND manually. Any ideas would be appreciated?

All Replies (19)

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Are you running Avast?

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APPLE MAIL works fine and connects fine. It is just Thunderbird. I want to keep T'bird as it's on the other computer. Want to stay consistent.

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I had the same problem & found Avast was interfering with Thunderbird's connection to comcast's email. Maybe another of your antivirus programs is doing it. Good luck!

Modified by John

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Thanks John.

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Who is the mail provider, and what are your server settings? POP or IMAP? TB version?

Help/Troubleshooting, click Copy text to clipboard, paste in a reply here, omitting everything below Security Software.

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my server is rebel.com and using imap.

If this helps.... This is my mothers iMac. I have my own email in my own user profile and it works fine with the same server. I tried a new user profile for her just to see if it works and it did not.


 Application Basics
   Name: Thunderbird
   Version: 68.4.2
   Build ID: 20200123140255
   Update Channel: release
   User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.4.2
   OS: Darwin 19.3.0
   Multiprocess Windows: 0/0
             Disabled
   Remote Processes: 0
   Enterprise Policies: Inactive
   Google Location Service Key: Missing
   Google Safebrowsing Key: Missing
   Mozilla Location Service Key: Missing
   Safe Mode: false
 Mail and News Accounts
   account2:
     INCOMING: account2, , (none) Local Folders, plain, passwordCleartext
   account6:
     INCOMING: account6, , (imap) securemail.rebel.com:993, SSL, passwordCleartext
     OUTGOING: , securemail.rebel.com:465, SSL, none, true
 Crash Reports for the Last 3 Days
 Remote Processes
   Type: Count
 Extensions
     Name
     Version
     Enabled
     ID
       Amazon.co.uk
       1.1
       true
       amazon@search.mozilla.org
       Bing
       1.0
       true
       bing@search.mozilla.org
       Chambers (UK)
       1.0
       true
       chambers-en-GB@search.mozilla.org
       DuckDuckGo
       1.0
       true
       ddg@search.mozilla.org
       Google
       1.0
       true
       google@search.mozilla.org
       Twitter
       1.0
       true
       twitter@search.mozilla.org
       Wikipedia (en)
       1.0
       true
       wikipedia@search.mozilla.org
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I can't find any useful info on rebel, but you have the authentication method on the outgoing server set to 'no authentication'. Tools/Account Settings, select Outgoing Server (SMTP) at the bottom of the left pane, then Edit the securemail.rebel.com server and change the authentication to 'normal password', which is the usual type for SSL on port 465.

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Its weird. It's like thunderbird has blocked her on this iMac. I made a new profile for her just to see. Set up her email account and will not connect. Yet, my email with the exact same settings but username works fine

outgoing port is actually set at 465 with normal password. I was messing around and forgot to put it back when i sent screenshot

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It works when I start the mac in safe mode but not in regular mode.

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If it works in OS X safe mode, the block is probably caused by a startup app, security or AV, that is scanning outgoing mail or secure (SSL) connections. The usual recommendation is to exclude the TB profile folder from AV scanning. What are the security apps on this computer?

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there is no firewall or AV

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What login items are disabled in safe mode? If it works for one user on this computer in normal mode, maybe the other user has a setting in TB that conflicts with OS X normal mode but not safe mode. The only thing I can think of is that if hardware acceleration is enabled in Preferences/Advanced/General, that might only work with the safe mode basic video drivers.

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hardware acceleration is disabled. was disabled. I tried enabling and then disabling.

how do i find out what items are disabled in safe mode?

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There is a link in the previously cited article:

https://support.apple.com/en-ca/guide/mac-help/mh21210/mac

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login items removed. still same result

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I have no idea how helpful your provider is, but in many cases it is a good idea to check the entries in the mail server's log file to get further information. Most often you can then figure out if it is a firewall problem, wrong password, wrong authentication mechanism etc.

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Thanks for all your help. I was just about to delete everything and reinstall everything when I thought....... why don't i just reset all the network settings. Deleted them and reinstalled new... BOOM!!!!!! It worked.

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This is the second instance of confirmed network issues on a mac, there were a couple of others, but no one posted back results.

If it happens again go into Thunderbird's options and disable the use of the system proxy. I would appear Apple has an issue and it might be a doozy, given the workaround apple support had one guy doing.