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It is possible. Purpose is sufficiently implementable.

There are two ways to be realistic.

Naver Mail Screen Automation

Open a browser logged in to Naver Mail After loading the draft mail, Enter customer email on recipient Replace [company name] or part of company name with actual company name in title/body Leave the existing attachments as they are. Click the send button Automatically send new mail via SMTP

I don't write drafts Save the same title/body/attachment as a template in the program Company name in Excel/CSV, automatically sent to email list If the * * “Drafted message content + Attachment” * * you mentioned is the key, then number 1, browser automation, is more appropriate.

However, I recommend making an automatic shipment like this to avoid mistakes.

Enter company name, email in excel file Pre-dispatch preview/test-dispatch function Send one and wait 3-10 seconds Failed clients recorded separately Speed limit invisible with bulk shipments Confirmation button before dispatching I can make it for you. This is usually what you need.
Client list excel or CSV file Exact phrases to replace in the body: for example, [company name] Whether to change the title as well Whether to use Naver Mail while logged into the browser as it is currently If you want, I'll make it in this folder in the form of Naver Draft Mail Automatic Sending Program.