Topic: qmail error 451 - could not auth to mail server

[tariqf]

Does anyone know what is causing this error in my qmail log?

@400000004471b2d715025584 delivery 67: deferral: Connected_to_127.0.0.1_but_greeting_failed./Remote_host_said:_451_Could_not_auth_to_mail_server/
@400000004471b2d715026cf4 status: local 0/10 remote 0/20
@400000004471b2e115f3d1d4 starting delivery 68: msg 641359 to remote tariqf@yourproblemsolved.com
@400000004471b2e115f5354c status: local 0/10 remote 1/20
@400000004471b2e1205d1284 delivery 68: deferral: Connected_to_127.0.0.1_but_greeting_failed./Remote_host_said:_451_Could_not_auth_to_mail_server/
@400000004471b2e1205d29f4 status: local 0/10 remote 0/20
@400000004471b2fc21968c84 starting delivery 69: msg 641370 to remote tariqf@yourproblemsolved.com
@400000004471b2fc21982a94 status: local 0/10 remote 1/20
@400000004471b2fc2b95f774 delivery 69: deferral: Connected_to_127.0.0.1_but_greeting_failed./Remote_host_said:_451_Could_not_auth_to_mail_server/
@400000004471b2fc2b9612cc status: local 0/10 remote 0/20

[tariqf]

I've sorted this although I don't know what caused it. I just restored a backup of /var/qmail/control to fix it.