5. Privacy Issues

Do not post private email you have received without the express permission of the sender. There are legal and copyright reasons for this, not to mention that doing so is very impolite. The same caveat applies to private messages, whether they're from this forum or anywhere else. If you receive rude or abusive private messages on this forum, please contact the administrators/moderators for assistance. Posting private information about forum users that is not available otherwise publicly will not be tolerated.

Perhaps a bit of a gray area...

If you receive a PM that contains a post, the fact that the post is public would seem to meet the "permission to quote" requirement; besides, you're really quoting the post. However, if the post has been deleted, that would indicate that the poster did not want it public, which indicates you do not have permission to quote it.

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Never attribute to malice what can be adequately explained by ignorance or stupidity.
Isaac Asimov