Questions tagged [dkim]

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 key retrieved from DNS.

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22 views

How to resolve “signing key too small” issue from mail-tester

We've recently been having some email delivery issues, so I find myself taking my first dive into the email server set-up world to make sure our emails are arriving as expected. I ran mail-tester a ...
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Change From (Sender) address using Postfix as a relay and pass validation

I'm trying to relay mail via Postfix and change the sender address whilst also passing DKIM/DMARC validation. So if I send an email from user1@domainA.com via the Postfix relay (using it as a smart ...
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55 views

How to implement DKIM for Domino mail server?

I'd like to write a Domino servlet that will stamp outgoing mail with a DKIM domain keys signature. We would generate the Domino mail server DKIM signature and put it in a TXT file with the DNS ...
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Setting up SPF record for A2Hosting shared hosting

I'm trying to setup A2Hosting SPF correctly since the proposed SPF is landing the emails in the SPAM folder in Gmail. This is the default SPF: v=spf1 +mx +a +ip4:210.125.99.77 ~all But when ...
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How does DKIM work when sending emails from multiple sources/servers?

So if I'm understanding DKIM correctly, it basically is a public/private key type of service. However, how does this work if you send emails from multiple servers/sources? For instance, I have a ...
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Postfix working on separate server having issues delivering mail to a specific domain

I have the following situation. My main domain is pointed to a Hostgator account. Because of bad performance of the site, the client decided to give DigitalOcean a go, but leaving the e-mails on ...
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32 views

E-mail body changed after DKIM signing

I've got a postfix e-mail server which uses amavisd-new for virus scanning, spam checking, DKIM checking and DKIM signing. I'm having issues with the DKIM signing in particular. Amavisd-new signs the ...
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what is the appropriate DMARC configuration for a domain that should fail hard on DKIM but soft on SPF

Messages sent by my domain will always be DKIM-signed and any that are not should be immediately discarded by recipients. But strict SPF enforcement leads to problems where internal mail-forwarding ...
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62 views

SPF- and DKIM- align fails on a few emails from a larger batch

We are sending large numbers of emails (hundreds of thousands) mostly for our clients. Of course, we have configures SPF, DKIM, and DMARC records properly for all domains who use us. We pass all tests ...
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With valid SPF, DKIM, and DMAR, Office 365 email still goes to junk mail and got Authentication-Results-Original: spf=none

My goal is to be able to send email from my website using smtp.office365.com and the emails will go into inbox instead of junk mail. But so far, I have not succeed. If the receipt is gmail, the ...
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Setup DKIM for Gmail and external mailhoster and domain registrar

I have a problem and so far, I am only finding too specialized answers to that problem. I have a managed server, including a mailserver at a provider A and I registered a bare domain example.com (...
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Library compiling version mismatch

While compiling I get the following error (warning is not a problem), /usr/bin/ld: warning: libssl.so.10, needed by ZMTA_SERVER/dependencies/lib/libopendkim.so, may conflict with libssl.so.1.1 ...
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DKIM Setup help for CMS from Subdomain

I have an email info@aqntech.com SPF and DKIM pass when I send email from user aqntech I have a CMS on a subdomain cms.aqntech.com which sends smtp email also as info@aqntech.com spf passes but ...
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SimpleDNS Plus command line for updating DKIM TXT records

Is anyone using SimpleDNS Plus command lines to update their DNS records? (Is it at all possible?) I would like to automate the DKIM record keeping; coding a batch file that would: update ...
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DMARC strict vs relaxed alignment?

I've been configuring DNS records for a mail server and got stuck when it came to DMARC's alignments. I know that both relaxed and strict are valid options, as well as relaxed being default setting. ...
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Exim delivers mail successfully but keeps it queued for no apparent reason. Recipients receive mail multiple times

I recently upgraded my exim4 mailserver from Debian 9 to Debian 10. Since then I have the issue that random emails get queued although no apparent error occurs and the emails successfully deliver. But ...
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DKIM validating, but mxtoolbox reports as “DKIM-Signature Not Verified”?

I'm trying to figure out why a lot of emails from one of my sites are not getting through (in particular sky.com and gmail.com). With my server, we have a tool that generates the DNS records for us: ...
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SMTP DKIM for 1 add-on domain on 2 servers

Is there a more practical way for SMTP DKIM signing for a VPS server that has a parked domain but does not host the content other than private key copying? I have looked all over Server Fault but ...
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DKIM failure “message has been altered”

Summary I have a Mattermost server which needs to send emails out to users when they sign up, etc. These emails are failing DKIM checks and showing up in users' Gmail as spam. Observed behavior I ...
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locking down with DKIM and SPF and received email that looks signed by our DKIM

We received this email which is definitely spam/spoofing our stuff(I don't have DMARC setup just yet and haven't finished setting up DKIM on one other service sending email for us). I don't get how ...
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84 views

DKIM set on AWS EC2 but mail header says none in Outlook

I'm configuring an AWS EC2 instance with Postfix, and have set it up with Route53 including reverse DNS. I've tested that I can send emails, and Outlook receives them fine, but Gmail does not. I ...
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SOLVED: Amavis and dkim signature on incoming mails: header.s ignored

I am a little bit confused with how amavis process incoming mails. The Postfix service on my Zimbra server is configured to sign outgoing mails. And it works like a charm. Problem is mails sent to ...
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57 views

All Plesk emails notifications do not have a correct dkim sign although it is signing correctly when sending normal emails

I am using Plesk on windows server 2012R2, The problem is that Plesk emails notifications do not have a correct dkim sign although it is signing correctly when sending normal emails I am using a ...
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141 views

SPAM Domain Spoofing through SES

A spammer seems to be running spam through SES and spoofing our domain. We are using SPF and DKIM so I’m not sure what is going on. This is our SPF record: v=spf1 a mx include:amazonses.com include:...
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Exchange 2016, multiple domains, correct DKIM setup?

Our Exchange 2016 server and set up is a bit of a mess, but the short of it is that we have numerous domains configured in it, including multiple separate business divisions that probably should have ...
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Does absence of SPF, DKIM, DMARC records on a domain affect the email delivery?

Say, I don't have these records for a domain at all and the email delivery is OK. Will those records improve something regarding the delivery or are they just a remedy for domain spoofing and are not ...
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Email FROM header authentication using subdomain delegation

Our company owns the domain somecompany.com and uses an external email provider emailemailprovider.com to send emails. The email provider recommends to delegate a subdomain for them to automatically ...
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Emails from my domain (hmailserver) are always in YahooSpam

Hi during sending out my mails from my domain luxpost.com they are placed directly into spam folder in yahoo. I tried to analyse the raw header and got only DKIM warnings. So I placed a DKIM entry in ...
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360 views

OpenDKIM query timed out (even with opendkim-testkey and Nameservers set)

I try to set up a mail server on Debian with opendkim and opendmarc When I receive an email, SpamAssassin refuse it because opendkim can't do the DNS query I tested with opendkim-testkey command, ...
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141 views

Change DMARC Report frequency

My current record look like this: v=DMARC1; p=quarantine; rua=mailto:varun1@varunagw.com; ruf=mailto:Varun2@VarunAgw.com; pct=100; ri=604800 Still for some reason, I receive E-Mail from Google ...
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Spamassassin and dkimproxy conflict in Postfix

I run my own Postfix server. While I installed spamassassin and followed plenties of tutorials, I never got it working. Today, by coincidence, I made progress master.cf smtp inet n - ...
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174 views

DMARC Report: Sometimes DKIM Fails for Mail Server IP

What does it mean when some DMARC records indicate a failure for the correct server: <record> <row> <source_ip>1.2.3.4</source_ip> <count>8</count&...
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262 views

How do I check for a DKIM-signature? (Postfix)

I'm running Postfix on my Debian client and I'm trying to setup DKIM. The problem I'm having is that the mails do not seem to get signed by DKIM. I'm using telnet to send an email from one local user ...
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122 views

Postfix does not pass mails to Amavis, when received from Z-push

Im kind of staring myself blind in how get ActiveSync to work correctly with my mailserver, so maybe anybody here have an idea? The deal is mailserver is hosting four domains and I want that all sent ...
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everything Pass but emails still go to the spam folder! I think it would be about hostname but not sure and don't know how to fix this

I checked too many topics and answers tested too many things! but can't find a solution to my problem. I'm a newbie user and maybe didn't understand some answers well. I need to fix this problem as ...
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1answer
94 views

Procmail recipe - If no dkim signature then forward to .spam

Having read through the documentation at http://pm-doc.sourceforge.net/doc/ i cannot find an answer. I want to use procmail to place mail without dkim into user's spam folder. I have found many ...
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Some incoming mail headers have “Authentication-Results: none”, why the checks are sometimes not being performed?

I saw in some incoming mail headers the following: Authentication-Results: mx1.example.com; none It means: The special case of "none" is used to indicate that no message authentication is ...
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3answers
443 views

Forwarding to Gmail doesn't work for emails from Microsoft.com due to DMARC, but works for PayPal.com

I've noticed that I'm not getting certain emails in my Gmail and Yandex.Mail that are forwarded via UNIX systems (without SRS — not too sure if Sender Rewriting Scheme is still the best practice? ...
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DKIM and SPF for Different Server [duplicate]

My situation like the following: Web server hosted in Google Cloud with domain name lets say: example.com Mail server hosted in Linode (lets say in server name: server.myserver.com) using cPanel with ...
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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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407 views

Will enabling DKIM for gsuite impact sending emails from 3rd party sender like Mailchimp?

If I enable DKIM for my gsuite domain (mydomain.com) will it impact mails sent from noreply@mydomain.com via 3rd party senders like Mailchimp/Freshdesk etc? My understanding is enabling DKIM for ...
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DKIM cname record name (generated by AWS SES) is > 63 characters which exceeds the DNS limit

i am working on a client site that has a long domain name (25 characters). when setting up AWS SES i am unable to update the CNAME DKIM records on the DNS provider as the maximum length allowed for ...
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148 views

How to allow Postfix to send on behalf of a domain using DKIM?

I have two servers: web and mail. The web server runs Apache and Postfix. The mail server runs Mailu, a bundle of preconfigured tools (Postfix, Dovecot, rspamd, etc.). The mail server hosts several ...
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How did this pass DKIM according to DMARC report?

I recently added a DMARC record for one of my domains. Let's call it mydomain.com: v=DMARC1;p=none;rua=mailto:dmarc_reports@mydomain.com;ruf=mailto:dmarc_reports@mydomain.com;fo=1" I have been ...
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DKIM & SPF records should be on the sender email domain or on the smtp domain?

I have two(2) vps servers. One of them hosts my website and the other has Postfix installed on it. VPS[1]: websitedomain.com VPS[2]: postfixdomain.com I am using smtp.postfixdomain.com to send an ...
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419 views

How to set up DKIM using Let's Encrypt?

For long time I'm using Let's encrypt for all my encrypted services (HTTPS, IMAPS, SMTPS, FTPS). Now I want to add DKIM signature for my mail server. But is this possible using Let's Encrypt? I have ...
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2answers
127 views

Further understanding of SPF, DKIM, and DMARC

I've been trying to wrap my head around some of the information I've gathered online, and I was hoping for some clarification. We are using Office 365, for our email server. A.) Are SPF records and ...
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300 views

dkim=temperror (no key for signature)

I use BlueHost hosted email and Gmail to actually send the emails via a "Send As" address. I've generated a DKIM 2048 length key, and updated my DNS records accordingly - two DKIM records due to ...
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80 views

managing digital certificates for email (postfix/dovecot) and DKIM

I am seeking to make emails my server sends have a higher reputation by implementing DKIM and DMARC. I already am passing SPF with the proper DNS entries. I also have a working Postfix/Dovecot ...
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hMailServer DKIM works on send, but fails on forward

Have my business mail server setup for DKIM and finally got it working so gmail will accepts messages from my business domains. However, I have an autoforwarder on some accounts to auto send messages ...

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