This article provides troubleshooting information when you have problems receiving messages. If you have problems sending messages, see Cannot send messages.
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The problem suddenly started after updating to Thunderbird version 78... Try this!
Thunderbird 78 expects higher security standards for the so-called TLS network encryption protocol. If your provider does not support the newer versions of the protocol, sending and receiving of messages may fail. You can temporarily lower the bar to check if this is the reason for your problem (which obviously reduces security, so it is not recommended). More details and instructions at Thunderbird 78 FAQ.
Is your account configured correctly?
To look at the settings for an account, select and from the sub-menu, then select for the account name from the list on the left. The connection to the incoming mail server is configured at the top of the page on the right.in the Thunderbird menu bar, or click the Application menu button and select
Your email account provider can give you connection information about their servers (probably on their website). Make sure your account settings match these settings.
- Manual Account Configuration (for instructions on using the New Account dialog for manual configuration)
- Automatic Account Configuration (for creating a new account)
Did your ability to receive mail suddenly stop? Was it working before?
- Check the service status of your ISP. (Many ISPs have a status or alert page on their website.) They may be having technical difficulties.
- If you use ESET/NOD32 antivirus, and since November 30, 2020 are not getting email or your IMAP folders disappeared, see https://support.eset.com/en/kb3126-disable-ssl-filtering-in-eset-windows-products
- If your ISP provides a web-based email interface, try to log in and view your mail. If you can see your messages, the problem is probably related to your account configuration.
- If you cannot log in to your ISPs web-based email interface, your password may have changed. If so, it must also be changed in Thunderbird. To change your password:
- At the top of the Thunderbird window, click the menu and select In the menu bar, click the menu and select At the top of the Thunderbird window, click the , or click the menu button menu and select and choose .
- On the panel, click on the tab and then click .
- Click on the relevant account and then click .
- Close and re-open Thunderbird. You will be prompted to enter a new password for the account.
- If you recently updated Thunderbird, the firewall component of your Internet security suite may have blocked access of the new version of Thunderbird to the Internet. When this happens, IMAP folders may also disappear. There is some basic information about antivirus products and their known bad interactions with Thunderbird here.
Remove Thunderbird from your firewall's list of trusted or recognized programs, then add it back manually (or when prompted). Otherwise, consult the documentation for your security suite / firewall / antivirus product for instructions on how to modify the firewall component of that product.
- If you recently updated Thunderbird to version 38, check whether you are being impacted by changes related to Logjam.
Are you receiving some emails but not others?
- Does your ISP have a spam filter that might be holding or deleting messages on the server?
- Have you created filters in Thunderbird that might be misfiling messages?
Are you exceeding mail provider access limits?
- Some mail providers (ISPs) impose limits on account access. For example Gmail limits simultaneous connections to 15 per account (approximately three devices, including phones) and downloads to 2.6 GB per day.