Comments with ' or " in are treated as spam

[NigelDunn]

On one site we've had a number of comments being automatically classed as spam where the user has included the character ' (& also possibly "). These are being converted into ' (when I've used print_r to put create the body text for wp_mail they're actually \') and then are being flagged as spam by wp_blacklist_check.

If I amend line 415 of wp-includes/comment.php to check for character 39 as well then the same comment is added into the comment list for approval.

No extra spam filters/plugins have been included on the site, it's just using the default processing supplied by WP 2.5.1. Nothing has been added to the comment blacklist setting in Settings->Discussion

The site is running on a shared Unix server & the hosting company have switched off phpInfo(), so unfortunately I can't supply the settings there.

We have to figure out why characters are being encoded before the blacklist check.

Possibly related to #8627 ?

I am trying to reproduce this in order to cross check relation with #8627 and #7821. I could not. Could anyone provide the steps necessary to reproduce this case?

I can't reproduce this with r10859, can any one else reproduce it? Otherwise it should probably be closed as fixed/worksforme.