Email templates sent from Salesforce may not show up as expected in Outlook or other email clients. These are a few of the issues you may encounter:
It is important to understand that Salesforce has no control over this. A message that you create and send in Salesforce or any email client, may not look the same in the recipient's email program.
Note: While this article covers all the email template types created either in Salesforce Classic or Lightning Experience, there are chances that issues can occur due to the usage of any custom HTML/CSS codes on 'Custom HTML' and 'Visualforce' email templates.
If your company is using the custom HTML or Visualforce email templates and facing issues, kindly work with your developers to validate the custom HTML & CSS tags and code to ensure they adhere to the standards and best practices and are adjusted and fine-tuned to meet User requirements. Salesforce Support may not be able to debug the HTML & CSS code for you as those customizations are 'out of scope' requests.
Troubleshooting
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