Dennis Putnam: > I have a machine running postfix that is required to relay mail > through my ISP's mail server. When I try to send mail, I get this error: > > 550 [PERMFAIL] destination not valid within DNS (in reply to RCPT TO > command) > > Can someone explain what this error means? If I use 'telnet' to send > the RCTP TO command manually it accepts it.
Type the recipient domain into a DNS checking website (see search
engine for examples) and see if they report any errors.
Wietse
