The plain text email is being sent into an Oracle-based CRM. Apparently, it does not decode quoted-printable, so it is causing an error with the extraneous characters appearing at the end of every line. Thanks for your help!
I’ve tried with SMTP (using Gmail), Gmail API, and SendGrid API.
OK, additional research indicates that this is due to “quoted-printable” encoding. Any idea on how to force Base64 encoding? Or some other solution that would prevent the use of quoted-printable encoding?