MessageBodyHTML = MIMEMultipart('related') MessageBody.attach(MIMEText(bodyText, 'plain')) MessageBody = MIMEMultipart('alternative') I am composing the email like this, in Python: message = MIMEMultipart('mixed') My question is thus: How can I format this message differently so that it will show up properly in all relevant mail clients? The limited information I have been able to find on the internet points to this being a bug with the Windows 10 mail client, but I have personally received other emails in this client with both inline and attached attachments, which are displayed just fine - so there obviously is some sort of workaround / alternative message structure that works. For some reason, the Windows 10 built-in mail client seems to show the inline image just fine, but shows no trace of the other attachment. This seems to work fine on every mail client I've tested except for the Windows 10 mail client. The MIME structure is setup like this: multipart/mixed An image embedded inline in the HTML body.Alternatives of plain-text and HTML message bodies.I am attempting to compose an email with: Having a weird problem with emails I am sending out via Python email / smtplib.

Outlook plain text email multipart