[KLUG Members] Issues send/receiving email to one domain

[members@kalamazoolinux.org]

The other side is I do believe is doing spam filtering through the firewall but 
I am being told that if you are block due to this filter the sender will get a 
notification.  Which did not happen.

My side is not doing any spam filtering.  Unless there is some obscure default 
setting.

Is there somewhere that you can check if a domain has been black listed?


Thanks
> > I have box that I can not send or recieve emails from one particular company 
> > (domain).  Obviously both sides are having the same problem and both have no 
> > problems sending or receiving emails from anywhere else.
> > Here is a snip from the sendmail log:
> > Jun  1 04:06:05 linuxserver sendmail[2996]: h4V0mVrg001458: 
> > to=<user@domain.com>, ctladdr=<admin@name.domain.com> (5 00/500), 
> > delay=1+07:17:34, xdelay=00:00:12, mailer=esmtp, pri=3000364, 
> > relay=mailserver.domain1.com. [12.34.56.78],  dsn=4.0.0, stat=Deferred: 421 
> > SMTP service not available, closing transmission channel
> > Is there any way to find out which end could causing the problems.  I did 
> > telnet in to the othe mailserver on port 25 and type HELO and I get a "421 
> SMTP 
> > service not available, closing transmission channel"  But i am not usre if 
> that 
> > is a good test as if there mail server is set-up correctly to dissallow 
> > relaying wouldn't I get theis error?
> 
> Any chance you have some SPAM filtering enabled on these boxes?
> 
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