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.

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38 views

Email: Protect spoofing from other users on same domain?

SPF and DKIM help to validate that an email was sent from the domain it claims to have been sent from. But what if a coworker spoofs another mailbox on the same domain, i.e. spoofing an email as ...
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Synology & Sendmail - I can not sign my mails with DKIM

I post here as a last resort, I did not find the solution to my problem. I installed optware on my Synology DS418 in order to have sendmail. I send mail at the command line using the /opt/sbin/...
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357 views

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 ...
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DKIM header verify failing

According to outlook and mxtoolbox, my dkim is passing, but the header verify is failing. I am using PHPMailer and Exim to send my messages. I tried editing my exim config to include only the header ...
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46 views

DKIM section shows verified and enabled in AWS SES console but spam checker tool shows Your message is not signed with DKIM

I am using AWS SES to send emails. My domain is verified. So any sender email under this domain should be allowed. DKIM section shows it's enabled and verified. I have added _amazonses TXT record in ...
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469 views

DKIM Email record

I have added a DKIM record to my websites DNS via my control panel. When I send an email from Thunderbird and test the signature, the SPF and DMARC show fine They do not seem to find a DKIM record ...
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33 views

How is connected Envelop From and Mail From mail header?

I was looking into mail header of a newsletter message sent by my company. I cannot understand how an external server (newsletter provider) can send message with them as envelop from but with my ...
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1answer
245 views

Using dovecot for submission, how to configure dkim?

All the tutorials that I've found regarding this issue always focus on postfix. But I'm using dovecot as the submission server. I'm under the impression that it does not use postfix to send emails. So ...
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Emails not getting delivered to users in China

I’m facing a strange issue with a codeigniter application which sends emails to registered users. The issues is that most Chinese users are not receiving emails which were sent from the application. ...
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1answer
412 views

Gmail softbounced forwarded messages with DMARC

-2 I have a system with spam/virus scanner (EFA) in front of a mailserver. On the mailserver mails coming from a sender with DMARC and forwarded to external emails like Gmail do Softbounce. I ...
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238 views

How do I troubleshoot DKIM?

I installed DKIM according to this guide: https://www.linuxtechi.com/configure-domainkeys-with-postfix-on-centos-7/ It signs the messages, but Google is still rejecting the mail. Jan 21 02:51:26 ...
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DMARC report shows DKIM alignment 0%

Our DMARC reports show one of our relays has 0% DKIM alignment: The header on a typical email from that address shows it passing SPF and DMARC, and includes Google's DKIM signature, but doesn't ...
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312 views

dkim fail: public key doen't seems to be valid

I created a public/private rsa key pair with Puttygen. I added the following record to dns but dkim fails. It seems there is some problems with my public key. I checked it with https://dkimcore.org/c/...
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349 views

How can I set up a DKIM DNS Record?

I currently run a website, hosted on a VPS. The software is Plesk. I have already setup an SPF Record and a DMARC Record, via the DNS Settings. I am a little stuck on how to set up a DKIM Record. ...
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719 views

Why my emails go to junk folder?

I registered a new .xyz domain name a few days ago. The domain name was never registered by others before. I set up a postfix server on a clean ip(checked its reputation). I set up SPF, DKIM, and ...
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1answer
85 views

Emails delivered to spam despite spf/dkim/dmark correct

I'm having an issue with the system-generated emails from my web server being delivered to spam folder or filtered out completely by spam filters. I am referring, for example, to a registration email ...
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1answer
1k views

postfix connection to opendkim refused

I'm trying to send mail from my ubuntu (17.04) server to gmail, hotmail but the email is going to spam folder. I've checked /var/log/mail.log and I found out that there is a warning about opendkim ...
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DNS, verify domain DKIM

I have 3 domains: example.com, example2.com and s1.example.com These 3 domains have their own servers When I sending mails any of them DKIM, SPF and DMARC are PASS but when I send mail form s1....
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bsd-mailx doesn't add From header which fails with libopendkim

We are using Plesk Onyx 17.0.17 with Postfix on a Debian Jessie server and have activated DKIM via Plesk. When I try to send a mail as root from the shell, this leads to the following error in maillog:...
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142 views

In DMARC report other IPs than mine fail check, but disposition is always “none”

I have trouble to understand the DMARC reports I receive. In all reports, I get some IPs that are not mine sending a couple of emails, fine, their checks (SPF or DKIM) always fail, but still the ...
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46 views

Is there any technical limitation while working with SPF record?

Can I add more than one data center's IP subnet to my existing SPF records or is there some limitation with SPF in any case? below is the sample SPF, this is not correct when you verify but this is ...
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371 views

Debug DKIM in email

A friend is sending me emails through a mailing list, and my IAP always flag those emails and prepend a <DKIM> tag in the subject. Some tools indeed indicate the DKIM signature of the email is ...
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196 views

Emails being spoofed? Constantly blacklisted

Please point me in the right direction if this isn't the best place to ask this but I manage a linux based (centos) server using Plesk. We were subject to a spam attack a couple of months ago where ...
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364 views

DKIM and Reverse Dns with sub-domain of onmicrosoft.com

When you sign up with Outlook 365 you get allocated a sub-domain like contoso.onmicrosoft.com. If you send an email from user@contoso.onmicrosoft.com should it not automatically be signed with DKIM or ...
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1k views

MS Exchange breaks DKIM during mail redirect

(due to issue with SO spam filter some names were replaced) Background: we have a small server (about 50 users, referenced as metalab.ifmoru in logs below), we allow to do a redirect to external ...
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115 views

Can spammers use DKIM to check if my mail is active?

I installed DKIM Verifier plug-in in my Thunderbird mail client, just to see how this DKIM technology works. I don't really understand details of that technology, but it seems to check the signature ...
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4k views

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 ...
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2answers
719 views

Google Apps Mail & Remote webserver: Email goes to spam even with DKIM & SPF

I believe my situation is extremely common. I have a site with the following setup. Registrar is Network Solutions. The DNS points to the webserver on Host Gator and the Email hosted on Google apps. ...
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114 views

Google Apps - Unable to receive emails on same domain despite SPF and DKIM confirmed

We're developing a site that will be sending emails from noreply@domain.com (this email account doesn't exist) to name@domain.com. domain.com has emails served via Google Apps; the MX, SPF and DKIM ...
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1k views

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 ...
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4answers
2k views

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 ...
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333 views

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 (...
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76 views

My new DKIM is in another format than I expected?

I am about to register a DKIM for a new domain. However, that format differs form what I expect. cPanel is giving me this: default._domainkey IN TXT "v=DKIM1; k=rsa; p=...
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725 views

How to add raw dkim record

I need to add my DKIM record as a text entry to my DNS. I have succeeded doing this for one domain already - cPanel gave me an entry like this: default._domainkey IN TXT "v=DKIM1; k=rsa; p=[lots of ...
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2k views

How do I block exim from sending spam?

My exim 4 is sending spam from a random-name@mydomain.com address. How is this possible and how do I allow only www-data@localhost to send and to only deliver from myname@mydomain.com to myname@gmail....
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530 views

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/...
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1k views

How to configure SPF and DKIM to prevent mail going to spam folder

x-store-info:4r51+eLowCe79NzwdU2kR0zqpsRfiBoycNOl1Rdc4Wf7430jtHWQcYIrKJBAYArutl6yTQ5VQNWAmHikfoeKC6OfxZYs5RQXt5EONp5Fb+tgLbPo7J+jhd2D/FrCdQyzXUlVTtfPnBo= Authentication-Results: hotmail.com; spf=...
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292 views

Setting up DKIM for Additional Domains on Google Apps to remove “via” message on Gmail

I have a Google Apps account on primary.com. Recently I added secondary.com as an additional domain to primary.com's Google Apps account. I then added an address @secondary.com to my account @primary....
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DKIM in roundcube

When connecting over POP3/IMAP externally (ie Thunderbird from non localhost) the report from port25 i get back is ========================================================== Summary of Results =======...
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247 views

DKIM only filters from pine, not php mail

I've setup DKIM filters by following the steps on this page: http://blog.mixu.net/2009/11/03/setting-up-spf-senderid-and-dkim-on-centos-5-3-using-sendmail/ I've verified that DKIM Signature headers ...
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92 views

DKIM configuration on Debian

Due to the fact that many e-mails we send with our company address do not get delivered, rejected or marked as spam, I searched for a solution on the web. One of the solutions I found was to use DKIM ...
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1k views

Generate DKIM Key on Mountain Lion OS X

I have been looking around for a way to generate dkim keys on my mac, I have looked into opendkim, there is no brew formula or taps available, tried to compile it from scratch and it required the dkim-...
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Connection timing out when connecting to Milter service [closed]

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 ...
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OpenDKIM Signing return fail when spaces in mail

Few days ago I install OpenDKIM Signing using on my CentOs 6 server by manual - http://stevejenkins.com/blog/2011/08/installing-opendkim-rpm-via-yum-with-postfix-or-sendmail-for-rhel-centos-fedora/. ...
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1k views

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 ...
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136 views

Computing Number of Bits in Public Key

I am working with DKIM and trying to compute the public key size of some DKIM signatures. I know from tools that Gmail's is now 2048, but how could I have figured this out myself (i.e., what exact ...
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8k views

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 ...
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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 ...
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5k views

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?