The author discusses a mysterious bug that caused a period to disappear in specific emails sent by their system. After much investigation, it was discovered that the bug was due to a specific rule in the SMTP server that removed periods at the beginning of new lines. By updating the code to add a second period in these cases, the issue was resolved, preventing a potential financial mishap where some customers could have been charged thousands of dollars by mistake. The bug was successfully patched, and the team alerted other departments to ensure they also addressed the issue in their systems.
https://tjaart.substack.com/p/the-curious-case-of-the-missing-period