I recently encountered a very strange problem in outlook 2007. E‑mails sent to large numbers of recipients (approx 30) were suffering from some corruption where a large part of the header was appearing in the content of the e‑mail. The appeared as a long string of random characters followed by some text (eg “Sosha1_v1;7” and “x‑cr-puzzleid”) that suggested the garbled text was part of the outlook anti-spam “postmark” feature. The e‑mail message appeared as normal below this corrupt text. Another symptom of the problem was e‑mail failing to send properly the first time send/receive was clicked.
Setting up this users account on another computer with outlook 2007 did not produce the same problems, and the original PC had previously been restored to working order by removing all e‑mail accounts, completely uninstalling office, and reinstalling. However, soon after the problem recurred!
After a lot of trial and error we eventually realised that this seems to be a bug (which is reproducible) in Outlook 2007, and is caused by using plain text for e‑mails. Most e‑mails do not suffer from this problem, but e‑mails sent to distribution groups are consistently corrupted. Switching back to HTML e‑mail cures the problem.
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