: Whenever I reply to an email to this list I got a failure notice (please see below)
The message you just send is plain text, but according to this failure your other message used HTML, so i would suggest checking your mail settings and always sending plain text mails to the list. It's possible that the messages you are replying to are already in HTML, but that wasn't enough by itself for hte spam filter to stop them, and then your client is asuming it should use HTML when responding to an HTML message -- but combined with some of the other spam flags your message raised, it is enough to stop your email. In particular, you may want to disable whatever "Reply-To" header settings you have, as the spam filter is detecting that it is forged. http://email.about.com/od/yahoomailtips/qt/et_plain_text.htm http://email.about.com/od/yahoomailtips/qt/et_reply_to.htm : Remote host said: 552 spam score (6.0) exceeded threshold (FREEMAIL_FORGED_REPLYTO,FSL_FREEMAIL_1,FSL_FREEMAIL_2,HTML_MESSAGE,RCVD_IN_DNSWL_NONE,SPF_PASS,URI_HEX ) [BODY] -Hoss