Update: Listserv Patch for Yahoo
A patch was installed during the maintenance window (5-7 a.m.) today in response to connections between listserv and Yahoo accounts. An outage of 5 minutes occurred during the implementation of the patch, however, users should not have experienced any degradation in service.
No messages or data was lost as a result of the maintenance.
More information: Update: Listserv Patch for Yahoo
Story added 1. May 2014, content source with full text you can find at link above.