You can attach any file, including other email messages, by drag and drop. You drop it onto the addressing box in Thunderbird (unlike Outlook where you drop into the message body.)

There is also an attach button on the Toolbar, and an attach function in the Menu, but these don't work for other email messages stored with Thunderbird.

The other way to think about it is to select all the messages you want to include, and forward them as attachments. The difficulty with this is that it may create one new message per selected message, or it may attach all the selected messages to one new message. ISTR there is an add-on that modifies the default behaviour, but I can't remember which way round it works. In your example, clearly you would want to attach all the selected messages to one new message.

Try selecting all the required messages, then right-click and click on "Forward as attachments". Here it creates one new message with all the selected files attached to it.

Thank you for responses, but does not appear to work.

I have tried opening a new email, then going back to my inbox highlighting a email, then dragging it into the new email, but it does not end up as an attachment?

Alas, forwarding is not a solution, as it would be confusing to the receiving recipient to receive a number of separate emails.

Any other Ideas?

Best Regards,

Oobals

Did you drop onto the address box in Thunderbird? It works here.

I don't understand your objection to forwarding; if I use the process outlined above, it adds the multiple selected messages to one new message. The outcome is identical to the drag-and-drop method.

Yes it work if you drag it into the address box. The mistake was that I have been making is dragging it into the writing section, which is how it works in Outlook.

The objection using forwarding is that if you are sending an email to say Ombudsman, you would want to attach all the correspondence you have sent or received from the third-party you are complaining about? If you use forwarding, it is confusing to the Ombudsman as they may received many emails that are not tied to your complaining email.

Many Thanks for your help and solution.

Oobals

"Forwarding as attachment" simply attaches selected messages to a new message. I don't see any difference in the end result between this and drag-and-drop of individual messages.