When an email is replied to in Windows Outlook, an item is added to the "References" header. This header keeps growing in size on each reply until it is split up by Outlook at 1012 characters. The problem is that the RFC SMTP line length limit is 998 characters, resulting in many servers rejecting the message as having lines that are too long.
This issue has persisted for many years and Microsoft seems uninterested in fixing it. All it requires is for them to reduce the references header split length in Windows Outlook to 998 characters.
Will Microsoft ever fix this?
