[OOT] [email protected] doesn't use FQDN sender domain

I did found on my maillog while registering to bugs.kannel.org:

Oct 12 22:28:40 mail postfix/smtpd[24779]: 3C31F7871: reject: RCPT from unknown[62.254.217.163]: 554 <[email protected]>: Sender address rejected: Domain not found; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<geodude.trigenix.org>

querying geodude.trigenix.org would got NXDOMAIN:

[root@home kannel]# host -t any geodude.trigenix.org
Host geodude.trigenix.org not found: 3(NXDOMAIN)

It is better to always use FQDN as a sender domain (reverse/return-path),
isn't it?  I have to whitelist trigenix.org for now.

Regards,

P.Y. Adi Prasaja