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speed DKIM signing in mail server

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http://serverfault.com – 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 signature ONCE and use it in all of the mails (maybe only signing the subject, that is common to the whole campaign). Is that possible? (HowTos)

xskl's picture
Submitted by xskl on 12/05/2012

Stories similar to speed DKIM signing in mail server

My domain is domain.tld, where I have DKIM functioning just fine. All of my domain emails are signed, and pass. I have a need now to send mail on behalf of my customers occasionally - ie: send email from john.doe@customers.tld, to sally@customers-customer.tld. I know that I can sign the Email with my domain.tld DKIM key, and it will "pass".

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 application sends mail (sign up verification, lost password, etc.) the email is not signed.

Set Up DKIM For Multiple Domains On Postfix With dkim-milter 2.8.x (CentOS 5.3)

This tutorial shows how you can sign your email messages by using DKIM (DomainKeys Identified Mail) for multiple domains. Signing email allows the recipient of a message to confirm a message originated with the sender's domain and that the message content has not been altered.

It took me a long time to figure out all the steps involved, so here is what you need to do.

1) Turn on DKIM signing in your outgoing messages by going to WHM, Acount Functions, Modify an Account. Edit your account by clicking "Enable DKIM on this account". Alternatively, turn on DKIM on CPanel - Email Authentication for your web site.

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 public key generated by all the servers is different,

but i want the public key to be same in all the servers so that i get dkim="pass" by entering the universal public key in the DNS hosting TXT r

DKIM showing bad format 44 weeks 1 day ago

Setting up DKIM on my Postfix/CentOS 5.6 server.

It sends and signs the emails, but Google still showing it neutral.

I have this problem with Exim.

DomainKeys Identified Mail (DKIM) lets an organization take responsibility for a message while it is in transit and one can use this to prevent from getting blacklisted by the free email providers like Yahoo, MSN and Google. DKIM can increase the mail authenticity. cPanel does not have an interface to enable DKIM like we have for SPF [...]

DKIM error 2 weeks 1 day ago

Im using several subdomains and each one has an account. I need to be able to send mail from those accounts that have correct dkim. Ive enabled spf and dkim in whm. I've used this command to generate the key "openssl genrsa -out /etc/dkim.key 1024 && openssl rsa -in /etc/dkim.key -out /etc/dkim.pub -pubout"

Do I need to copy public key in every account's DNS zone individually?