Who Knew Email Subjects Are So Complicated?

Courier encountered an issue with email subjects being truncated or rendered incorrectly in Microsoft Outlook due to the default character limit of 127 characters, which restricts support for non-UTF-8 characters. To solve this problem, they discovered that encoding email subjects in base64 and using a specific format (RFC 1342) allows the server to decode and render them correctly. However, they also encountered limitations with some email providers and had to implement a recursive encoding process to ensure compatibility. The solution involved checking for Microsoft Outlook as the culprit behind the issue, rather than assuming it was a local configuration problem, and using online tools such as UTF-8 email subject encoders to test and refine their approach.

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