BUG: Scrambled email

[benshaji-sequoiaat]

Describe the bug
I have an AWS Lambda which sends email to users when needed. The email script is written in python. Mails are only sent when some events are produced. But some mails seems scrambled when user gets it in the inbox. See below screenshot. The html styles are not applied.Its a broken mail basically.

I use gmail to send it because the mail is bought from google mail with custom domain.

To Reproduce
This issue cannot be reproduced successfully. As i said, it only happens randomly.

Expected behavior
A clear and concise description of what you expected to happen.

Email provider:

• Email service: Gmail
• Application to view the email: Outlook web

Environment (please complete the following information if relevant):

• AWS lambda
• Python 3.9

Additional context

• Redmail version: 0.6.0 (pip)