http://postmaster.yahoo.com will allow you to contact the postmaster team for assistance. I've reported this error already, but fixing it won't help you any; basically, the web page without the link is all Yahoo's willing to publicly say about that error message, you'll need to talk to postmaster for help debugging your particular situation. Elizabeth ZwickyYahoo Mail On Monday, April 27, 2015 2:02 PM, Matthew Black <Matthew.Black@csulb.edu> wrote: One of our user’s e-mail messages to Yahoo bounced with the following link for more information: http://postmaster.yahoo.com/errors/postmaster-27.html which redirects to https://help.yahoo.com/kb/postmaster/SLN5067.html?impressions=true That page contains a link to “Yahoo Mail and Yahoo Messenger Terms of Service”, which is broken! http://https//info.yahoo.com/legal/us/yahoo/mail/en-us/<http://https/info.yahoo.com/legal/us/yahoo/mail/en-us/> It redirects to an https link  saying, Server not found. I hope someone from Yahoo can fix this. matthew black california state university, long beach