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[cobalt-users] Problems with smtp



Hi,

Anyone can tell me what is this error, '550 5.0.0 unwanted email rejected'

I have 4 RBL in my sendmail.cf (sbl.spamhaus.org, relays.ordb.org,
dnsbl.njabl.org and spamcop.net)

All users send smtp ok, but two users receive from pop3, but can not send
smtp e-mails.

The error is the following:

servidor: '550 5.0.0 unwanted email rejected', Puerto: 25, Seguridad (SSL):
No, Error de servidor: 550, Número de error: 0x800CCC78

Thanks

Un saludo, Danny