You can use our Email to Record Importer automation for this. This automation will generate a unique Email Address that you can then send/forward emails to. For any email received in this inbox, the automation will store the email's subject in the Subject Field, the sender information in the Sender Field, the body in the Body Field and any attachments in the Attachments Field.
Limitations
Formatting in emails may not be processed correctly.
The entire email body will be saved as one field, extremely long emails (e.g. with many replies) may run into field's limitations.
Setup
Prepare the destination Airtable table. Add text fields for the sender and subject, a long text field for the email body, and an attachment field if you want to keep attached files.
Create the Email to Record Importer automation and choose that table.
Under Setup, select the Sender Field. Map Subject Field, Body Field and Attachments Field to the destination fields you want to fill.
Open the Email Address section and copy the generated address.
Send a short test email to that address, with a small attachment if you mapped the attachment field. Check the resulting Airtable record before setting up forwarding or sharing the address.
Incoming emails trigger record creation; you do not need to run a batch for each email.