How can I avoid Quota Limits on Mail Servers?

How can I know my server quota?

It depends on your server. If you use a free mail server or your ISP’s mail server, please search on its support articles. If you use a corporate mail server, you may ask your administrator.

Last, if you use an IMAP account which provides indication of its quota (this is not always the case), you can either:

  • check if the quota is indicated in your folder’s properties. Right click on your Inbox folder, select Properties and then the Quota tab.
  • simply wait until Thunderbird displays a quota indication in its status bar. It is only shown when it is useful, which is not before your storage capacity is over 75%.

How can I decrease the size of my emails on the server?

In order to do some clean up, it’s good to have good indicators of:

  • how big are your folders?

Folder size is not indicated in Thunderbird, so you need to install an add-on in order to display it. You can either choose Mail Summaries or Extra Folder Columns.

  • how big are your mails?

Simply check that you have chosen to display the Size column in the Message pane. If you don’t, please read the Message List Columns article to add it.

POP server

On a POP server, all the incoming messages are downloaded to your computer. Depending on your choice, a copy of your messages can stay on the server until you move them to another folder or delete them, or until a certain time. So if you need to free some space, you should consider to:

  1. Check the current size of your Inbox folder.
  2. Delete some of your old email in your Inbox folder, especially the larger emails. Sort your messages by size in order to easily detect which of them take the most of space.
  3. Archive your older mails in order to move them out of your Inbox, and consequently to delete them from the server (but keep them locally).
  4. Check the new size of the Inbox folder in order to be sure that it has decreased has expected. If this is not the case, compact the folder (from the File > Compact Folders menu).

IMAP server

On an IMAP server, all your messages and folders are synced between Thunderbird and your mail server (please read the IMAP synchronization article for more details). So if you need to free some space, you should consider to:

  1. Delete some of your old email in all your folders, especially the larger emails. Sort your messages by size in order to easily detect which of them take the most of space.
  2. If you want to keep a copy of your mail but don’t need the attachment anymore, you can simply detach the attachment from the mail, because attachments generally take most of the space.
  3. Archive some of your older mail. However, if you simply move them to another folder on your IMAP server, you won’t win back any space. To resolve this, you need to set your “Archive” folder under your “Local folders” account and not as a subfolder of your IMAP account.

Call +1-856-514-8666 for help and support.

How to Fix Mozilla Thunderbird not Starting?

Causes of Thunderbird Not Responding

If Thunderbird refuses to start and returns an error about an existing Thunderbird process, it’s because Thunderbird thinks your profile is in use. The cause might be a stale profile lock that was left after Thunderbird crashed. This means Thunderbird didn’t close properly or correctly clean up temporary files. Additional processes are running in the background and Thunderbird is confused, frozen, and unable to open.

Another cause might be that Thunderbird is running on another computer. Thunderbird can’t run on more than one computer at the same time with the same profile.

How to Make Thunderbird Start Again

If Thunderbird is running but not responding, or it’s saying that your profile is in use, here are the steps you should try.

  1. Close and reopen Thunderbird. It’s always worth a try to close the application and then reopen it. Select Thunderbird > Quit Thunderbird from the menu, and then reopen the application to see if this solves the problem.
  2. Close Thunderbird on another computer. If Thunderbird is running with your profile on another computer, close Thunderbird on that machine by selecting Thunderbird > Quit Thunderbird from the menu. Then log in again on the computer you’re using.
  3. Kill Thunderbird’s background processes. Even if you closed Thunderbird, the application might be running in the background. Ending Thunderbird processes that are running in the background might fix the issue. On a Windows system, do this from the Task Manager.
  4. Restart the computer. Restarting is an easy fix that often solves many technical issues.
  5. Start Thunderbird in Safe Mode. This starts the application without certain extensions or add-ons that caused the error message. Open in Safe Mode and see if this solves the problem.
  6. Delete the parentlock file. The parentlock file is created every time Thunderbird starts and should automatically clear after you close Thunderbird. If Thunderbird fails to complete the closing process properly, the parentlock file isn’t deleted. Manually delete the file to see if this solves the problem.
  7. Use the LockHunter file-unlocking tool. Use LockHunter to see what’s restricting Thunderbird from opening, and then shut down any holds on the program so that you can use it normally.
  8. Repair Thunderbird folders. A folder may be corrupted. Repair Thunderbird folders to see if this solves the problem.
  9. Create a new Thunderbird profile. There may be something wrong with your Thunderbird profile. Profiles in Thunderbird and Firefox store information about your settings, mail, accounts, and extensions you installed. If something goes wrong, back up your profile and then create a fresh one.
  10. Reinstall Thunderbird. If none of these troubleshooting steps solves the problem, move your profile folder to a different location to back it up. Then, reinstall Thunderbird without a profile present. Everything should start fresh.

How to Fix unable to send Email Messages in Thunderbird?

Steps to Fix Unable Send Email Messages in Thunderbird :

If you are unable to send email messages from your Thunderbird account, there can be two reasons behind this:

  • Inappropriate Thunderbird Settings
  • Blocked Port 25 by ISP (Internet Service Provider)

Solution – To resolve this error in Mozilla Thunderbird, perform the following:

Step 1: Ensure that Thunderbird settings are appropriately configured:

  • Incoming mail server (POP3/IMAP server):
  • Outgoing mail server (SMTP server):
  • Username: the full e-mail address like [email protected]
  • SMTP authentication must be enabled for the login to be successful.

Step 2: Try using alternative TCP port 2525 for SMTP Server.

How to set up Mozilla Thunderbird for ProtonMail Bridge?

Steps to set up Mozilla Thunderbird for ProtonMail Bridge :

1. In Windows and Linux, open Thunderbird, right-click in the sidebar → Settings.

In macOS, go to Tools → Account Settings.

2. Click Account Actions and select Add Mail Account from the dropdown menu.

3. Enter your nameemail address, and ProtonMail Bridge password from your ProtonMail Bridge account settings. 

The rest of the settings (security settings, ports, etc.) should be filled in automatically, but you can check this by clicking on the Manual Config button.

You also need to click Manual Config if you are using a custom domain. Enter all the settings provided in ProtonMail Bridge by clicking on Mailbox configuration under your account username. Do not use your regular ProtonMail account details

4. You will be asked to confirm a security exception for Port 1143 on server hostname This is your localhost port, which means that the certificate we provide must be self-signed, and is therefore not trusted by default in Thunderbird.

5. Thunderbird will now fetch your emails, which can take up to five minutes. You can send emails immediately.

You will need to configure some additional settings for Thunderbird to work correctly with your ProtonMail account. 

6. In Windows and Linux, go to your Inbox, right-click your account name → Settings. In macOS, go to the menu bar → Tools → Account Settings…

7. Go to Copies & Folders and disable Place a copy in. Then scroll down to Drafts and Templates and make sure that drafts are kept on Local Folders. (On some Thunderbird setups, Local Folders is instead called your default account name).

Note: Drafts are saved on your local device only. If you create a draft in Thunderbird on your laptop, it will only be saved and accessible on that device.

You can now use Thunderbird with ProtonMail Bridge.