Says My Defalt Mail Clientis Not Properly Installed

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• craigslist | help > system status
  ... status current issues 301: handsanitizer - viruses, you say? Updated Thu, Jul 15 - 12:12 PDT....), and the anti-virus software (if any) installed on your computer. 300: Email delays Sorry, ...measures should resolve the general delays, but delivery of mail from AOL users will continue to be delayed (possibly multi-...this afternoon, image uploads were not working properly users may need check their posts ...
• craigslist | about > help > generic DNS
  ... message, here's what to do: The easiest solution is to use the mail server of your ISP to relay your ... almost certainly have their DNS setup properly in the way we would like. If you're not sure how to setup your mail client to do this, please contact your ...able to send email through your own mail server, you will need to contact your ...you have a static IP address, run a mail server and do not have ...
• craigslist | about > help > rdns failure
  ... is happening "under the hood", here's an explanation: NOTE ! Fixing DNS issues can be complicated and is not...possible, we try to be sure that the server is who it says it is. Validating that DNS is setup properly for the connecting server is a great way ...lookups match up properly, the connecting computer has been validated to continue to talk to our mail server.  However, when they don't match...