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Questions tagged [dkim]

DomainKeys Identified Mail (DKIM) enables email senders to associate a domain name with a specific email by signing it with a digital signature, verifying that the email hasn't been tampered with in transit and that the sender is authorized to send email on behalf of the domain name owner.

66 questions
11
votes
2 answers

Configure Thunderbird to verify DKIM signature and display an icon to this effect?

Is there any way to configure Thunderbird so that it would verify DKIM signatures of incoming mail, and show a status icon a bit like the HTTPS indicator in browsers?
RomanSt
  • 9,959
9
votes
2 answers

How do I enable DKIM for bounce messages in Postfix

I have set up a linux email server with Postfix and have correctly set up SPF and DKIM. When I send an email, the email is signed properly, and when I view the source from the receiving client (such as gmail), I can see that SPF and DKIM passed. I…
Stephen S
  • 628
6
votes
0 answers

Connection timing out when connecting to Milter service

I'm using a VPS with CentOS 5, containing Postfix and OpenDKIM. I have set up OpenDKIM using this guide. Everything seems to work properly as the log in /var/log/maillog does not report anything other than that OpenDKIM is running. The problem is…
user1640348
  • 161
6
votes
2 answers

Using a 410 character DKIM TXT record on namecheap

Update: It has been confirmed with Namecheap that their DNS is incompatible with Google Apps for Domains DKIM keys https://twitter.com/Namecheap/status/720940172196581376 There is no ETA on when or even if they will have it fixed. I signed up for…
user16930
6
votes
3 answers

Configure Postfix to reject mails with invalid DKIM signature

I have configured Postfix to sign my mails using OpenDKIM. (I followed this tutorial.) Now I would like to configure Postfix to reject mails for domains that have DKIM configured and the mail lacks a proper signature (eg. when my own domain is used…
Gene Vincent
  • 375
4
votes
0 answers

Why is Google Workspaces not setting DKIM keys for alias domains?

When sending email from our primary domain via Google Workspaces, Google fixes a proper set of DKIM keys in the header. When sending email from our secondary domain, Google is inputting partial DKIM keys that do not validate when tested at DKIM…
Varinia Devorah
  • 508
4
votes
2 answers

opendkim not working - opendkim-genkey: openssl exited with status %d

opendkim-genkey: openssl exited with status %d This is the error I get when trying to create a DKIM key. My emails are working for gmail fine but failing when sent to hotmail / outlook. I am hoping by adding a DKIM record this will help, but I am…
cuznerdexter
  • 141
3
votes
1 answer

DKIM Signature Failing - DNS record lookup is incorrect

I am running Ubuntu 12.04 on a Linode with Postfix and opendkim. My DKIM signature is validating/passing when I test at http://www.brandonchecketts.com/emailtest.php but it is failing when I test with autorespond+dkim@dk.elandsys.com. The problem is…
MountainX
  • 2,214
3
votes
3 answers

GMail SMTP rejects email from my domain, claiming it is a "security risk" if I haven't authenticated

This evening I sent an email to a Cornell University address of someone, following a website interaction; I'd not written him before. I got this in reply from MAILER-DAEMON@cornell.edu (anonymized): (expanded from …
einpoklum
  • 10,666
3
votes
4 answers

Linux tool to check DKIM-signed emails

I receive a lot of email signed with DKIM. Usually I am not interested in checking that the signature is valid, but every now and then I would like to. Is there any tool to which I can feed the email as it is, which checks it (possibly retrieving…
Giovanni Mascellani
  • 643
3
votes
1 answer

Who should sign mail with Dkim?

I have an exchange server configured to use an external smarthost to send email. If I want to complete my messages with DKIM signature should it set to my Exchage server o may I ask to my provider (smarthost) to sign them?
Tobia
  • 2,403
2
votes
0 answers

Enable DKIM header in sent emails Exim or CPanel

I have enabled DKIM in WHM/CPanel/exim. DNS has valid DKIM keys for "default" selector. Everything seems ok. I downloaded email from gmail and looked in header and it misses DKIM header. /var/cpanel/domain_keys/private has valid key for that…
Max
  • 259
2
votes
0 answers

What is the selector field for when validating DKIM records?

I am trying to use http://dkimcore.org/tools/ to validate my DKIM records. I am using http://elasticemail.com to send email from my site and I need to set these text records up on my DNS. I don't know what the selector field is for to test my…
finny
  • 31
  • 1
2
votes
2 answers

Why won't Microsoft Exchange 365 sign with DKIM anymore?

I setup DKIM for my domains in MS Exchange 365 on-premise. It worked properly for a long time but recently I found out some of my mails are sent to the receivers spambox as my mails are no longer signed. authentication-results: dkim=none (message…
Daniel W.
  • 2,048
2
votes
2 answers

DKIM & SPF Allignment for Subdomains

We have a primary domain name example.com that has both adkim=s and aspf=s defined in its DMARC policy. Now, we have multiple subdomain names for this primary domain, such as postman.example.com. The subdomain has SPF, DKIM and DMARC TXT records in…
Granwille
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