On Wed, Oct 14, 2015 at 07:39:03AM -0400, Ruben Safir wrote: > I've been using postfix with majordomo for years and it suddenly stopped > working after an upgrade, and I can't shake down the cause of the error > yet. > > 2015-10-14T07:30:40.667469-04:00 www postfix/sendmail[24192]: fatal: > owner-hangout@some_server.com(28): No recipient addresses found in message > header
Looks like an incorrect invocation of sendmail(1). If this is by majordomo, it should have provided at least one command-line recipient address. I would not expect Majordomo to use sendmail -t (extract recipients from the headers), and yet that error message is only logged when "sendmail -t" is used. Start by checking how Majordomo is configured to invoke sendmail(1). This is not a Postfix issue. -- Viktor.