This hadn't even crossed my mind, but it probably has yours. Anyway, if you have a mailing going out in the near future, know that, effective immediately, the U.S. Postal Service is not accepting any periodical or standard mail destined for certain areas in Mississippi and Louisiana, including New Orleans. I'd suggest upi suppress these addresses on your mailing lists until mail service is restored.
For more information on the specific zip codes impacted, please see the USPS's latest service posting.