>I know it sounds like a DNS issue on their side BUT:

it's not
>
>I have been able to e-mail them
>  from other servers and AOL.  This has been going on for a over a 
> week.  The domain is techie.com

whoa, hosted by NOTORIOUS BIG SPAMMER:

# dig techie.com mx

; <<>> DiG 8.3 <<>> techie.com mx
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 0
;; QUERY SECTION:
;;      techie.com, type = MX, class = IN

;; ANSWER SECTION:
techie.com.             1D IN MX        10 techie-com.mr.outblaze.com.
techie.com.             1D IN MX        20 techie-com-bk.mr.outblaze.com.
>, they are hosted by mail.com

whoa HEAVILY forged @sender.domain
>  When I use the dnsstuff lookup they seem fine. BUT when I do an nslookup 
> I get nothing for them. I can't figure out why I can't e-mail them.  Any 
> help, ideas would be appreciated.

Some network operators use BGP to blacklist certain networks as voluminous 
sources of mail abuse.

can you traceroute from imail to their outblaze MX?

what's in your logs?

Len


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