On Mar 15, 2006, at 6:40 PM, Aleksey Cheusov wrote:
> Can anybody explain me, what it is expected by NetBSD's SMTP server?

RFC-822 (-2822) expects your machine will provide a fully-qualified  
domain name when it does a HELO.

> My `hostname` shows me 'chen', my hostname.

Yes.  That's not fully qualified.

> I didn't set domain name (where it is specified in NetBSD),
> is it really necessary? I yes, how to obtain it from my ISP
> (PPTP protocol is used for setting internet conncection,
> pppd + pptpclient)?
> IP address is obtains dynamically from my ISP.
> MUA is emacs/gnus, if it does matter.

Using a FQDN is pretty much required if you want to relay mail from  
your machine directly, but instead you could forward all email to  
your ISP's mailservers as a SMART_HOST.

-- 
-Chuck