Greylisted by my own server?


to test my servers (that is:
I've got one domain at namecheap. Using their SMTP to send mails but my
own VPS for the apache hosting and I run an own Postfix SMTP on my as well) I wanted to send one email from to

Unfortunately I got greylisted which shouldn't be a big problem in case
I'd use Thunderbird or similar clients.
But I use a CRM system (VTiger) which apparently seems not to be trying
to send out the mail again (which is the correct behaviour in cases of

Now I'm wondering - if I send mails to customers via this CRM, I might
get greylisted and those mails might never arrive - right?

Which server is greylisted? The sender? Listed by the receiver?

Jul 22 07:40:14 nudin3 postfix/smtpd[2558]: warning: dict_nis_init: NIS
domain name not set - NIS lookups disabled
Jul 22 07:40:14 nudin3 postfix/smtpd[2558]: connect from[198.*.29.105]
Jul 22 07:40:15 nudin3 postfix/smtpd[2558]: Anonymous TLS connection
established from[198.*.29.105]: TLSv1 with cipher
DHE-RSA-AES256-SHA (256/256 bits)
Jul 22 07:40:16 nudin3 postgrey[2893]: action=greylist, reason=new,, client_address=198.*.29.105,
sender= ... at domain2 dot com, recipient= ... at domain3 dot de
Jul 22 07:40:16 nudin3 postfix/smtpd[2558]: NOQUEUE: reject: RCPT from[198.*.29.105]: 450 4.2.0 < ... at domain3 dot de>: Recipient
address rejected: Greylisted, see
<a href=";" title=";">;</a>
from=< ... at domain2 dot com> to=< ... at domain3 dot de> proto=ESMTP
Jul 22 07:40:16 nudin3 postfix/smtpd[2558]: disconnect from[198.*.29.105]

Hope someone can help me with this .. but not sure whether it's postfix