re :I set up Thunderbird on NEW HP laptop with Windows 11. Check Firewall: Is Thunderbird set up as an allowed program? If no then please make sure Thunderbird is in the list of allowed programs. Do you allow the Anti-Virus product to scan incoming mail? It's possible the AV has intervened and scanning the image so the display got interupted. Image attachments can be displayed if 'View' > 'display Attachments Inline' is selected, so I need to know if image is inline or an attachment. Is that image an attachment or embedded inline as part of the email ? check you have this setting: View > Message Body As > Original HTML Have you got the settings set up to download full copies or only headers meaning the email is retrieved and downloaded on demand ? Is there a restriction on downloaded file size? Account Settings * 'Synchronisation & Storage' for imap account * Select 'Keep messages in all folders for this account on this computer' * click on 'Advanced.,.' button * Make sure all the folders are selected to do a full download. Any folder not selected will only download headers and click on OK Under 'Disk Space' * Select 'Synchronise all messages locally regardless of age' * Suggest you do NOT select the checkbox 'don't download messages larger than X kb' Located some useful information: * https://kb.mozillazine.org/Entire_message_fetched_when_opening_an_IMAP_message '''mail.imap.mime_parts_on_demand''' defaults to true. It specifies that Thunderbird should analyze the messages headers if the message size is larger than '''mail.imap.mime_parts_on_demand_threshold''' , and fetch only the pieces of the message that will be displayed online. In my case the Threshold is 500000 = 500 KB Menu icon > Settings > General Scroll to bottom and click on 'Config Editor' button It opens in a new tab. Try this: In search type: '''mime''' look for : '''mail.imap.mime_parts_on_demand''' on far right is the toggle icon - click on it to toggle the value to 'false' Restart Thunderbird and test again.