Wietse Venema: > > Thinking that postfix > > must wait to get that 220 message before trying to send any commands. > > Anyone else had this kind of issue? I did notice when I do a telnet > > SMTP session to that server from my workstation (a Windows machine) > > I get the 220 message when it connects. > > Perhaps they have blacklisted your IP address, because it was sending > spam or malware from an infected machine.
Another possibility is "security" software on the server itself (reportedly, some anti-virus products mess with outbound SMTP). Wietse