Performance improvement in email display

Some HTML emails with a large number of inline images or links were taking quite some time to display (many seconds). This was due to a regular expression bug in our code that was causing the web-bugs and phishing detection code to be many times slower than it should be. This has now been fixed.

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Large messages now have “X-Spam-known-sender” header added

After a recent upgrade to our email delivery system, there was a bug where large messages (>500k) would never have the “X-Spam-known-sender” header added, even if the From address of the email was a known sender. This was affecting a small number of users who use “White list only” spam protection level and were receiving emails with large attachments. This has now been fixed.

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