How to convert EMLX to PDF using Apple Mail?
You can convert EMLX to PDF by using a apple mail .Open the EMLX File: Double-click on the EMLX file to open it in Apple Mail.
Select the Email: Click on the email you want to convert to PDF.
Go to File Menu: In the top menu, click on File.
Export as PDF: From the dropdown, select Export as PDF.
Choose Save Location: A window will pop up asking you where you want to save the PDF file.
Save the PDF: Choose the location, name your file, and click Save. You can also use a third-party tool like the Dailysoft EMLX converter tool

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Avarozer commented
If you want to use Apple Mail to convert an EMLX file to PDF, first, open the EMLX file by double-clicking on it so it opens in Apple Mail. Once the email is open, click on the "File" menu at the top of the screen and select "Print." In the print dialog box, look for the "PDF" button at the bottom-left corner and click on it. From the dropdown, choose "Save as PDF." Choose the location where you want to save the PDF, give it a name, and click "Save." This way, you'll have your EMLX email saved as a PDF without losing any content. You can also use a third-party tool like the FixVARE EMLX converter tool. That tool is one of the best and easiest to use. There is no technical knowledge to use