DomainKeys Identified Mail is a scheme for signing and verifying email messages to confirm that that the source hasn't been forged, and is typically implemented by MTAs. The source MTA adds a header to the message body containing a signature, and the destination MTA verifies this signature against a ...

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2answers
413 views

How to force postfix to use ip that is configured for domain?

I want to confirm to SPF and DKIM, this requires me to send email using the IP written in the DNS record of the domain I have two domains example1.com and example2.com with two IPs 100.0.0.1 and ...
0
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1answer
71 views

speed DKIM signing in mail server

I'm running email sending campaigns with milions of emails, and I need to sign each and one of them with DKIM. Unfortunately that's the bottleneck of the process. I wonder if I can calculate a DKIM ...
0
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2answers
863 views

Sent mails go to spam on Gmail but not on Yahoo

Why is a message like the following going to Gmails SPAM folder? I noticed that the same message goes correctly to Yahoo!s Inbox, but observing the header i see (in the received Yahoo message the ...
1
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1answer
83 views

DKIM for Email Service Provider clients

How would you go about implementing DKIM signing in this scenario? You have a service that allows customers to logon to your web application, create a newsletter, and send it to their subscribers ...
2
votes
2answers
867 views

What is the correct mail set up for multiple domains on one server?

I have a machine (centos 5) with one external ip address. On that machine I have many virtual hosts with a few different top level domain names and sub-domains under those eg. sub1.domain1.com ...
1
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0answers
334 views

Sendmail rewriting headers after OpenDKIM signature

I have run into a problem described in section Sendmail REWRITING FEATURES on http://www.opendkim.org/README: Due to the way the milter protocol is incorporated into the MTA, opendkim sees the ...
0
votes
2answers
570 views

Exim: How to turn off DKIM for forwarded mail?

I have DKIM configured in Exim for outgoing mail, as per the documentation. Exim signs all outgoing mail. But some of those outgoing messages are forwards, thanks to a user's .forward file. This is ...
0
votes
1answer
531 views

How do I setup Postfix (Ubuntu) and Google Apps to DKIM sign outgoing emails?

I am using Linode and have built a LAMP stack. I setup Google Apps (free edition) to handle all incoming mail. I've also setup Google Apps to use DKIM authentication. The problem is when my ...
0
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2answers
225 views

DKIM, spam probability, signing with key at mail server vs sender domain? [duplicate]

I'm working on an email marketing tool and so far we've been recommending our customers to set up an SPF-record (Sender-ID) and a DKIM-record, we also have our own SPF-record on the mail server and a ...
1
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1answer
101 views

Sendmail's maillog polluted by dkim-filter

I just added domain keys to my sendmail configuration and everything appears to be working. However, upon reviewing the maillog I get a ton of these when an email gets sent or received: Oct 4 ...
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2answers
164 views

Is there a common X-Header for RFC 2821 “MAIL FROM”? Should it be DKIM signed?

w.r.t. the difference between RFC2821 MAIL From and RFC2822 FROM I'm considering having my MTA add a header specifying what was sent in the MAIL FROM portion of the envelope. The RFC2821 header is ...
4
votes
1answer
305 views

Does DKIM works with subdomains?

ISP's recommend you segment your marketing and transactional emails by using different IPs. I want to start using DKIM, but since DKIM is a domain based reputation system I wonder if signing with the ...
1
vote
1answer
138 views

Ubuntu precise, postfix, google apps - outgoing mail

a n00b question from a developer, not an server admin. I'm learning - built out a linode box and have included Wordpress multisite. I have Google Apps (free) setup to handle incoming. WP sends emails ...
0
votes
2answers
643 views

Unable to send mail to hotmail from rackspace cloud

I'm having issue sending mail from postfix on a rackspace cloud instance for my domain. Hotmail says "550 SC-001 (SNT0-MC4-F35) Unfortunately, messages from 198.101.x.x weren't sent. Please contact ...
1
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1answer
107 views

DKIM sign any outgoing mail as the same domain. is possibly?

I have a website, and the users recommend via email to another persons, so the mail come from my site, but I need to appear the user as sender, but "via" mydomain. The logically and what lists ...
45
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6answers
11k views

Fighting Spam - What can I do as an: Email Administrator, Domain Owner, or User?

This is a Canonical Question about Fighting Spam. Also related: How to stop people from using my domain to send spam? What are SPF records, and how do I configure them? There are ...
0
votes
1answer
144 views

DKIM signing having same public key

I have 20 servers hosted on orderbox DNS hosting,I have set up opendkim on all servers with signing by domain say "example.com" i.e d=example.com in DKIM header of all the server outbound mails. The ...
0
votes
2answers
456 views

How do I set up DomainKeys/DKIM and Sender ID

I have searched far and wide for a guide on how to setup DomainKeys/DKIM and Sender ID. I understand there are text records you add to your DNS, but I cannot find out how to create theses, ...
1
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1answer
942 views

Exim DKIM Error: DKIM: signing failed (RC -101) no matter what private key I try

I have this problem with Exim. DKIM fails on signing outgoing mails. This is the /var/log/exim4/mainlog output (Debian Squeeze): 2012-08-02 17:11:33 1Sx1k5-0004Tk-9D <= me@my_domain.com U=me ...
1
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2answers
752 views

postfix not reporting FROM address to opendkim

I am trying to setup an DKIM email signing for a postfix SMTP server. This server is to be used by different services on the local network. I have generated DKIM key pair, added it to my domain and ...
1
vote
3answers
1k views

DKIM showing bad format

Setting up DKIM on my Postfix/CentOS 5.6 server. It sends and signs the emails, but Google still showing it neutral. The errors I'm getting are: dkim=neutral (bad format) header.i=@r02.lbsmtp.org ...
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votes
1answer
88 views

Outbound mail signing…?

My scenerio is " php application---->Load Balancer----->smtp server...>relaying My load balancer receiving mails from php application from different domains now for DKIM we need to sign by ...
3
votes
1answer
72 views

What is the benefit of using DKIM to sign Content Type?

DKIM has the ability to sign headers on a per-header basis. I looked at Google's headers, and they DKIM sign ContentType. What is the security benefit of signing ContentType?
2
votes
1answer
73 views

Understanding the many “FROM” addresses that apply to SenderID, DKIM, and SPF

Can someone tell me when and why a client, MTA relay, Unix .Forward, anonymous relay, or listserver will create, or alter these headers: Resent-Sender: Resent-From: Sender: From: If you can please ...
3
votes
1answer
420 views

What problems can an ADSP record in DNS cause for mailflow?

ADSP is an entry in DNS that works allows a domain owner to assert that all email must be signed with DKIM. (similar to the -all and ~all in SPF/SenderID). Messages that fail ADSP policy may be ...
0
votes
2answers
216 views

DKIM signed mails go to spam folder and do not show key icon

I have installed DKIM for my sendmail and I have also configured it. But I still see that my emails are being considered as spam by gmail. Also, I do not see the "key" in the emails (even if I unspam ...
1
vote
2answers
501 views

What are DKIM (DomainKeys Identified Mail) and The SPF (Sender Policy Framework)?

I recently saw that cpanel has new entry for DKIM (DomainKeys Identified Mail) and The SPF (Sender Policy Framework). They seems to be talk about a mail/spam prevention, etc I would like to ...
0
votes
1answer
77 views

Rewrite header when no dkim header for specific domains

I have been receiving a lot of mails that are "From" my domain. These mails have usually a different return path (spf passes), but have for example my email in the to and the from header. ...
5
votes
3answers
2k views

PTR OK, SPF, DKIM passed but email messages are marked as Spam by Google?

# host 1.2.3.4 4.3.2.1.in-addr.arpa domain name pointer mail.domain.vn. # dig +short txt domain.vn "v=spf1 a mx ptr -all" # dig +short txt mail.domain.vn "v=spf1 a -all" Here's an email header ...
0
votes
1answer
328 views

Effective configuration of dkimproxy in multiple-domain scenario

I have a postfix/dkimproxy setup that doesn't work the way I like. I have exampledomain.org with SPF allowing mail only from server.exampledomain.org (rDNS mapped correctly) which is also aliased by ...
1
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2answers
385 views

dkimproxy unable to read private key

I just found this error in my server logs May 17 14:55:07 marcus dkimproxy.out[1005]: signing error: Error: cannot read /etc/ssl/private/dkim_server/dkim_server.key: Permission denied dkimproxy ...
0
votes
1answer
285 views

dkim-testkey return keys do not match after key's creation

as in the title I am struggling with the creation of the dkim key. For key creation I use these commands openssl genrsa -out s1024.private 1024 openssl rsa -in s1024.private -out s1024.public -pubout ...
1
vote
1answer
246 views

DKIM failure when using Exim4 as an “edge transport” for Exchange 2010

I have a server running Exim 4.72 that is set up similar to the Exchange "Edge Transport" role: it forwards mail from the internet to Exchange and forwards mail from exchange to the internet. I ...
1
vote
1answer
1k views

How can I change exim's DKIM and SPF for emails sent?

I've now spent 2 hours trying to figure out this issue and I am about to give up and go to bed. I've been having issues with Gmail rejecting emails from my VPS server because of false spam alerts ...
0
votes
2answers
420 views

How to setup same DKIM setings for multiple servers

I have three servers configured to relay mail. I am using dkim-milter with postfix on CentOS 5.5. I created domain keys on the command line for each server. My issue is that the domain key is ...
1
vote
1answer
1k views

DKIM on postfix relay server

I have a postfix/amavis relay server, with the domain name mail.example.com. It will be a relay for dozens of VPS's, which will have domains like hostname.example.net. So i have actually two ...
2
votes
1answer
683 views

How to fix DKIM for mail on VPS hosting?

I have a hosted VPS that is fully managed by the hosting company. For weeks they cannot figure out how to get DKIM working for my emails, even though in cPanel's Email Authentication section says DKIM ...
1
vote
1answer
3k views

How to setup X-SID , X-AUTH & X-DKIM at windows server 2008 r2 with IIS 7.5

I am very sad that my legit emails drops to spam box while i receive many spam emails into my inbox. I very rarely send announcement emails to my all registered members (over 400k right now) but most ...
1
vote
1answer
332 views

using own mail server with external domain and dns. Now have internal dns. dkim test not working

I am not very knowledgeable in this area, but have been able to make great head way. Now i am stuck I setup my own mail server, e.g mailbox.example.com. I had the domain dns point to my mail server ...
1
vote
0answers
280 views

Not Connecting from my zimbra webmail

I have configured zimbra webmail on centos 5.5 64bit server for e-mail authentication. I have installed DKIM and dk-filter on it after installation to check authentication. I tried to open zimbra by ...
0
votes
1answer
119 views

Spf dkim edit dns zone mailing issue

I am running an hosting company and i was previously affliate of hostgator. when i sent mails from my domain to my customers it would come as info@example.com via hostgator.com and mailed by ...
0
votes
1answer
481 views

adding DKIM signature to email where dkim=pass

I am building a e-mailing app and I am using Amazon SES API to send emails and long with that I am adding the DKIM signature to the email which are being sent. Presently the app is in the testing ...
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votes
2answers
290 views

SPF and DKIM configuration with postfix [closed]

I am using Centos-5 and have configured postfix mail server. How to i configure SPF and DKIM in Postfix.
1
vote
2answers
420 views

How do I use an include statement in a TXT record?

We have a client that is using an email service that requires a TXT domain key reocrd that is over 127 characters long. I'm pretty sure BIND allows this, however we run djbdns with tinydns and it ...
0
votes
3answers
200 views

Sending email from a 3rd-party-hosted server

We contracted with a 3rd party vendor to build and host a web application for us. The web app will need to send email notifications out to users when they request it. The application is not hosted ...
0
votes
2answers
306 views

exim dkimproxy configuration - explanation?

I'm trying to setup DKIM on exim in a cPanel VPS. I'm going with the DKIM Proxy option since cPanel is seriously dragging its feet with the it's-definitely-coming 11.32 release. These guides here, ...
0
votes
1answer
491 views

How do I setup a SMTP ID to my server?

I am trying to increase email deliverability, from what I read, most important things I need to have set are SPF records, DKIM and sender ID, I set SPF and DKIM, but... "sender ID" is same as "SMTP ...
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votes
1answer
286 views

Confused with Domainkeys. Help?

I generated a domain key for my domain at http://www.socketlabs.com/services/dkwiz and got the following two things generated. Generator Key1: Setting up Hurricane Server Edit the configuration for ...
2
votes
1answer
2k views

How to add DKIM feature to the IIS 7.5 - Windows Server 2008 - DomainKeys Identified Mail

How to add DKIM feature to the IIS 7.5 - Windows Server 2008 DomainKeys Identified Mail
0
votes
2answers
1k views

DKIM-filter is signing mails with invalid DKIM signatures (v=1 instead of v=DKIM1 etc)

I followed the dkim-filter install instructions from Ubuntu's community help page My dkim-filter is signing DKIM signatures with this v=1; a=rsa-sha256; c=simple/simple; d=my.domain.com;s=mail; ...