mail server bouncing emails...

hello..
we have a linux mail server and are using postfix.
when email is sent to us SOMETIMES the email bounces.

I did a traceroute on our domain
and below is the output.  What does this mean?
I have called our DSL provider because it seems that the problem would be with them...
any ideas?

TraceRoute to xxx.xxx.134.40 [mail.xxxx.com]

Hop (ms) (ms) (ms)  IP Address Host name
1 0 0 0  66.98.244.1 gphou-66-98-244-1.ev1.net
2 0 2 0  66.98.241.4 gphou-66-98-241-4.ev1.net
3 0 2 0  66.98.240.5 gphou-66-98-240-5.ev1.net
4 1 2 1  129.250.10.189 ge-2-0-0.r02.hstntx01.us.bb.verio.net
5 11 8 8  129.250.5.100 p16-0-3-0.r21.dllstx09.us.bb.verio.net
6 44 46 44  129.250.4.196 p16-1-1-2.r20.lsanca01.us.bb.verio.net
7 70 44 138  129.250.29.122 ge-1.a01.lsanca18.us.ra.verio.net
8 46 46 46  129.250.29.131 ge-1-0.a01.lsanca02.us.ra.verio.net
9 41 42 41  198.172.117.162 ge-9-3.a01.lsanca02.us.ce.verio.net
10 42 42 42  206.117.24.22 isi-interworld.ln.net
11 43 43 43  206.124.224.6 usc-atm2.interworld.net
12 Timed out Timed out Timed out   -
13 Timed out Timed out Timed out   -
14 Timed out Timed out Timed out   -
15 Timed out Timed out Timed out   -

Trace aborted.

bionicblakeyAsked:
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ChrisDrakeConnect With a Mentor Commented:
If it is being bounced by your own mail server, the reason will be in you mail log file: check out /var/log/maillog to see.

If the remote servers cannot reach you, the reason is probably because you have not got your MX record set up properly.  Tell us your domain name and/or email address, we can check and tell you what is wrong.  You probably also want to go to www.DNSreport.com - it can automatically check all your settings for you and tell you exactly waht to fix immediately.

Network failures do not cause email to bounce: it just queues up until the failure gets fixed, so tracert is irrelevant (and FYI - the "problem" you think you had is not really a problem - it's just some device in the middle has a firewall and doesn't repsond to your tracert request).

reverse-DNS is also not a problem for receiving emails - only for sending them.
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PsiCopConnect With a Mentor Commented:
"I did a traceroute on our domain and below is the output.  What does this mean?"

Absolutely nothing, really. traceroute uses ICMP packets, and many ISPs routinely block or drop them at their borders to prevent blackhats from probing their networks. Its not uncommon to see traceroute timeout like that.

What you need is the bounce messages. The complete bounce E-Mail, including fill headers. Have someone print and fax it to you, if that's whats needed to get your hands on it. Once you have that, THEN you will have the info you need to begin troubleshooting.
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kenfcampConnect With a Mentor Commented:
> when email is sent to us SOMETIMES the email bounces.

As PsiCop stated, to get any "useful" advise you should really get and provide header details.
(these will usually tell you what the problem is or atleast where to focus your attention)

With that aside there are 4 common reasons why this could.

1) The domain in which the email was sent from doesn't have reverse-DNS setup (or setup properly)
* some ISP's have been looking at this before accepting email (Earthlink, AOL, etc)

2) The domain in which the email was sent was either forged or is on the network and/or ISP's black list

3) Server configuration

4) Network failure (local or @ the ISP)

As I'm sure you can see, w/o specific information it will be hard to tell you where your issue is likely to be.
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