undeliverable messages

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Exchange security
Microsoft Exchange
Users are unable to send to certain domains (rr.com, aol.com)First message is a delay message, then undeliverable with error #4.4.7. I have looked everywhere for a solution. Any help appreciated.

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Not sure about this specific error but I have seen similar issues if you do not have reverse DNS setup on your external facing DNS server. Many times the accepting ISP will run a reverse DNS lookup on your domain to see if it is legit.

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  • Platypus
    I agree -- having a reverse DNS in our record solved most of these problems for me. I still have occasional problems with some of the rr.com domains, but that's another issue. I'd also suggest not to be be afraid to bring in a good network consultant to look over your network configuration -- you'll usually find it's money well spent. David
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  • Cooper5
    I do have reverse DNS setup, but rr.com and aol are still rejecting emails. What do you think about setting up a Smart Host? Or setting up external DSN to handle external (Internet)mail. thanks for the help.
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  • Brandonbates
    When it doubt, use telnet. Use nslookup (or dig if linux) to get the mx record the server is seeing. (in nslookup use SET TYPE=MX) Once you have the hostname it's trying to contact do: TELNET hostnamefromabove 25 you won't usually see what you are typing, but you should get a response something like "220 something something something...." If you don't even get that far, you either are contacting a bad host (bad dns record) or your ip is blocked and you should go check places like: http://openrbl.org/client/ http://www.spamcop.net/bl.shtml http://www.senderbase.org/?searchBy=ipaddress&sb=1&searchString= http://www.robtex.com/ Some of those will also tell you if your reverse dns is setup correctly. (Below if you see < or > those are less than and greater than signs, so don't type them literally) If you do get a 220, go ahead and type HELO nameofyourdomain.com See if you get 220 OK or some other OK message. Then type: mail from: <someemailatyourplace@yourdomain.com> rcpt to: <personyoucantestwith@aol.com> DATA Subject: send back if this works . At this point see if you get an ok or any messages. If you get an error at any point before take note. If you get errors at the helo or from you may still have some reverse dns or other similar problems. Try it out and go from there.
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  • Dtorizuka
    What brandonbates said... This site can do your reverse lookup and an email test too http://www.dnsstuff.com/ You should also check with the admin at the receiving end to see if they have you on some internal blacklist?
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  • Cooper5
    Thanks for your input. I did the telnet and when I tried to send mail to aol i got the 550 will not relay message. I discovered i was on dsbl list. submitted info to be removed, but havent heard anything. i have contacted rr and they state we are not blacklisted by them. will have to wait. this is all so annoying.
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