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DKIM, Exchange server

Posted on 2010-09-17
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Last Modified: 2012-06-27
Good day experts.

I have been having a hell of a time trying to get unblocked by Yahoo mail services.

We have 2 domains both direct to our exchange server, PTR records are in place and all seems well, but for what ever reason we can not send mail to yahoo email. I confirmed we have not been compromised in any way. the issue started 10 days ago and i think this is what happened one of my users forwards that a recipient and email then it got added to spam then that same user kept sending here the same email 20 times in the same day because the recipient said she did not get it, (turns out it was in her Junk) so now we are blocked, i have requested to be delisted from Yahoo but all I am getting is automated response.

I have tried everything so now i am looking at DKIM

can some one help me here on how to get this up and running so i can resolve this issue.

thanks guys.
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Question by:jjanknegt
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Accepted Solution

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Glen Knight earned 500 total points
ID: 33702352
I can't help with DKIM but I can help you solve the yahoo issue without it.

See my blog post here: http://demazter.wordpress.com/2010/02/11/yahoo-blocking-senders/

I had the exact sane problem caused by a typo in my rDNS record.  Unfortunately there doesn't seem to be a way to get yahoo to re-evaluate once it has been corrected.
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Author Comment

by:jjanknegt
ID: 33702495
Thank you very much i hope this helps, the boss is blaming me.

do happen to know the yahoo email address i should send to?
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LVL 74

Expert Comment

by:Glen Knight
ID: 33702513
It's all detailed in my blog post.  Including the email address.
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Author Comment

by:jjanknegt
ID: 33702518
also how do i find out my Mail Server Hostname

Thanks
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LVL 74

Expert Comment

by:Glen Knight
ID: 33702597
Your mailserver host name is the computer name followed by the internal domain name.  Which part are you referring to?
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Expert Comment

by:Glen Knight
ID: 33702609
Oh the mailserver hostname? This is your rDNS name, which should be the same as the A record used by the MX record.  There is a link on the blog for DNS configuration.
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Author Comment

by:jjanknegt
ID: 33702614
thats what i thought.

got that, i was referring to the first few questions IP address and host name.

Thanks

Jeff
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Author Comment

by:jjanknegt
ID: 33702642
lost me there, the first question it asks for Mail server Host: name would that be

mail.fazzariopartners.com
or
fazzari-server1.fazzarica.local.


Jeff
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Expert Comment

by:Glen Knight
ID: 33702668
It would be mail.fazzariopartners.com

But, the rDNS record must match the A record used by your MX record, see my article here: http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2370-Exchange-DNS-Configuration.html
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Author Comment

by:jjanknegt
ID: 33702723
Yes that is all configured.

A record, and 1 MX record.

My ISP has the PTR in place for mail.fazzariparnters.com and mail.fazzarica.com. tested and live.

so i should be good.

thanks tons for you help, great blog. going to add it to my feeds.
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Author Comment

by:jjanknegt
ID: 33703329
if I have a PTR record do i need to have a reverse lookup in the smtp protocol.
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Author Closing Comment

by:jjanknegt
ID: 33738550
Thanks man, I submitted the forum from your blog on friday and they un-blacklisted us by sunday.
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