Qmail -- problem s pošiljanjem

[Kham]

Lepo pozdravljeni vsi skupaj!

Imam instaliran qmail na strežniku in èe želim poslati pošto na nek naslov 
(gre za konkreten naslov), mi nazaj pošlje tole:

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Hi. This is the qmail-send program at mail.mojserver.com.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<info at neknaslov.si>:
195.246.0.20 does not like recipient.
Remote host said: 550 <info at neknaslov.si>, Recipient unknown
Giving up on 195.246.0.20.
########

Èe pa pošljem enak mail na isti naslov, samo z drugega accoounta (na drugem 
strežniku), mi lepo deluje.

Kaj je narobe?

Mimogrede: za veèino e-mail naslovov mi lepo deluje. Zavraèa mi samo za ene 
par naslovov.
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Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.483 / Virus Database: 279 - Release Date: 19.5.2003