On Thu, 2015-10-15 at 21:09 -0400, Wietse Venema wrote: > > Clearly the sending server is not talking the SMTP protocol correctly, > > but would someone mind explaining the reason why please? > > This error message is described in a "readme" tutorial. > http://www.postfix.org/POSTSCREEN_README.html
Thanks Wietse. Sorry, I went straight to Google, rather than diving into your excellent documentation! I still don't quite understand what's going on though. I've tried the test myself with a telnet connection, and I can see that I initially receive the teaser banner. When I then reply to that with "HELO ..." and try sending an email, I do indeed receive a protocol error. What I don't understand, is what I should be doing to make it work correctly? From reading the SMTP standard, the server sends a greeting, and I send a HELO command, so what am I doing wrong? How do I "skip over" the teaser banner? Thanks, Andy
