Email issue

By Charvell ·
Some emails that a vendor or ours sends are getting bounced back to them. The interesting part is, when I check our logs to see why it was bounced, there is no record of the email every making it as far as our email filter. We use AT&T's email filtering servcie, which we can log into and see all emails that have passed through their filter. I have confirmed that all of our SMTP traffic routes through the email filter before it hits our server. Are there any other steps I can take to try to figure this out?

My feeling is the issue is on the vendor's end. They were able to send me one of their NDRs and from what I can tell they are using a Unix or Linux based system to attempt to send these emails. If I am reading the NDR correctly the DNS service they are sending it to is one I've never heard of and haven't been able to find much information on them.

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Can you copy the NDR message here

by netwrk_admn In reply to Email issue

If you copy the NDR message I'm sure someone has used that mail server and can tell you exactly why.

9 times out of 10 if you are getting all email and it's isolated to one vendor, it's always on their end. We just have to be nice saying it. :)

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NDR Message

by Charvell In reply to Can you copy the NDR mess ...

training@removed: host[]
said: 550 5.7.1 <training@removed>... Relaying denied (in
reply to RCPT TO command)
Reporting-MTA: dns;
X-Postfix-Queue-I 61EE22D7E962
X-Postfix-Sender: rfc822; john@removed
Arrival-Date: Thu, 25 Feb 2010 14:28:12 -0500 (EST)

Final-Recipient: rfc822; training@removed
Original-Recipient: rfc822;training@removed
Action: failed
Status: 5.7.1
Remote-MTA: dns;
Diagnostic-Code: smtp; 550 5.7.1 <training@removed>... Relaying

I removed the domains for email address to prevent spamming and to protect privacy, noted by "removed".

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relaying denied

by netwrk_admn In reply to NDR Message

is any smtp server under your control? If not, it's safe to say it is something they have to fix. The emails aren't going any further than that smtp server.

If you are unsure, you can probably check any message options internet headers (for Outlook) in your inbox to see how mail gets routed to you - ex which smtp servers handle each inbound message.

Usually relaying is denied when there is an authentication requirement for the sender, maybe someone turned off allowing anonymous senders through.

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new info

by Charvell In reply to relaying denied

In doing some digging with our company we apparently had a temp mailbox with but we haven't used them in a while. Do you think a refresh of their DNS would resolve this?

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Where do your mx records point to?

by netwrk_admn In reply to new info

If all other mail from around the world comes to you (and has for a while), i see no reason for theirs not to unless they set it static on their end. Refreshing their DNS will do no good.

MXTOOLBOX(dot)com is a place i go to for authoritative results on mx records.

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