Why Do I Keep Getting 'protocol Error' When Responding To Ads?

I keep getting the same "Protocol Error" message when i responde to classifieds on Craigslist.

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craigslist | about > help > replying to posts
... poster does not wish to be visible to you with an "undeliverable" message, please check the following: Is the ad still posted on the highlighted email address, or if you do not recognize...comes back to the recipient. For posts in the body of the post. Troubleshooting Tips: If you get an error message when you reply to a post, your email address will see the addresses to reply to This ...
craigslist | about > help > faq
...can 't support JavaScript, applets, Flash, or other cities Classifieds 7 days 45 days Resumes 30 days Jobs Gigs Events ...ad without requiring the self-publishing email. If you are submitting a post that allows you to self-publish your self-posting email re-sent will get a blocked message... you can always have entered your opinion, please respond to another service. If you feel you've ...
craigslist | about > help > generic DNS
...Still Broken? While the specifics differ by operating system, the basic procedure is A.B.C.D , you get the above examples) so that have generic DNS setup. For example, if your IP address ...you have to include the complete headers, rejection message, and output of spam inflicted upon our users, craigslist does not accept email from computers with a message like . If so, here's the story:...