Old email file

I have an old RTF file with a continuous list of hundreds of email messages, exported from my old Performa probably 15 years ago. I'd like to get them back into Mail or Outlook or something so they can be searched by date/sender etc. Below is a sample of what it looks like- the old MIME formatted headers. Since they're not individual message files or in some sort of mbox container I haven't found an import/conversion solution. Any help would be great... (I blanked out the details below)

From - Sat Apr 4 11:40:05 YYYY

Return-Path: <xxx@email>

Received: via …

Return-Path: …

Received: …

Received: …

Received: …

Date: …

From: …

X-Mailer: Mozilla 4.01C-MOENE (Macintosh; U; PPC)

MIME-Version: 1.0

To: …

Subject: …

X-Priority: 3 (Normal)

Content-Type: multipart/alternative; boundary="------------

2AC3D531732883D89BDCE860"

Status:

X-Mozilla-Status: 0001

Content-Length: 7907