https://mailchimp.com/help/create-a-plain-text-campaign/
Create a Plain-Text Email | Mailchimp
Use a plain-text email format to send simple, no-frills emails without images or text-formatting. Learn how to build and send a plain-text email.
plain text emailcreatemailchimp
https://useplaintext.email/
Use plain text email
plain textuseemail
https://support.mozilla.org/en-US/questions/1532966
email passwords in plain text and not a huge string of characters and numbers | Thunderbird Support...