To convert EML to MBOX manually, you can follow these steps:
Open your email client and select the emails you want to convert to MBOX.
Save the emails as individual EML files to a folder on your computer.
Open a text editor such as Notepad or TextEdit.
Create a new file in the text editor and copy the following text into it:
From MAILER-DAEMON Fri Jul 2 19:08:45 2021
From: Your Name yourname@example.com
Subject: EML to MBOX Conversion
Date: Fri, 2 Jul 2021 19:08:45 -0400
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="boundary_text"
--boundary_text
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
This is a message with multiple parts in MIME format.
--boundary_text
Content-Type: application/octet-stream; name="filename.eml"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="filename.eml"
<Insert the base64 encoded content of the EML file here>
--boundary_text--
Replace "filename.eml" with the actual name of the EML file you want to convert.
Encode the contents of the EML file in base64 format. You can use an online base64 encoder tool for this purpose.
Copy the base64-encoded content of the EML file and paste it into the "filename.eml" section of the text editor file.
Save the text editor file with a .eml extension.
Repeat steps 4-8 for each EML file you want to convert.
Open your email client and create a new folder to store the MBOX file.
Open a command prompt or terminal window and navigate to the folder where you saved the EML files.
Run the following command to concatenate the EML files into a single MBOX file:
cat *.eml > /path/to/mbox/file.mbox
Replace "/path/to/mbox/file.mbox" with the actual path and filename of the MBOX file you want to create.
Import the MBOX file into your email client or any other application that supports the MBOX format.
Note that this method can be time-consuming and may not preserve all email metadata. Using a third-party converter tool may be a more efficient and reliable option.
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