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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0
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1answer
799 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 ...
0
votes
1answer
15 views

Using DKIM in my server for multiple domains (websites)

As I couldn't find this exact tutorial in Stack, I share my findings with al of you. I always get things solved thanks to this comunity. Thanks! Original question: I've read the tutorial posted by ...
0
votes
0answers
5 views

How to add identity in dkimproxy?

DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=simpel-mailclient.com; h= from:to:subject:message-id:date; s=k1; bh=5eALQvUpOrW373J9iUFeZW p3Nag=; ...
41
votes
6answers
6k 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 ...
2
votes
1answer
1k views

postfix + opendkim not signing correctly. how to debug this?

EDIT: I did get a little further but all posts on my search say permissions are wrong or regenerate key but I fixed that to be 644 as well as owned by DKIM AND I keep regenerating the key but it is ...
0
votes
0answers
13 views

Adjust Authentication-Results header and verify DKIM reports are being send

i'm running OpenDKIM 2.9.1 through Postfix 2.11, using the following configuration. https://gist.github.com/sibok/97a8e33d5f7309b4fa1c As you can see i enabled DKIM reporting but i can't see any ...
2
votes
3answers
353 views

no signing table match in opendkim

I have opendkim installed on centos. I am using postfix as MTA and dovecot for imap/pop... Now the problem is am trying to setup dkim for my domian. The mails are send from a sub domain ...
1
vote
0answers
28 views

Postfix configuration with DKIM to send mail from multiple domains

My current setup is a Postfix installation configured with DKIM on a server with hostname prod01.example.com The server is used to send out mail on the form webshop@example.com, ...
0
votes
1answer
750 views

What is wrong in my DKIM setup? I'm getting all fails

I own a domain name I have implemented SPF and DKIM to avoid my mails being junked. I have also upgraded to DMARC in monitor mode. Since I received a few failure reports recently I wanted to ...
-4
votes
0answers
45 views

Email still going to SPAM folder after SPF and DKIM enabled [duplicate]

I'm having some trouble figuring out why my e-mails are being sent to the spam folder in almost all servers. Here I post the message received to one of my hotmail accounts (sensitive information ...
0
votes
2answers
795 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; ...
2
votes
1answer
40 views

DKIM and SPF for a subdomain

I manage a VPS on Linode accessed through subdomain.domain.com and I need to send email from this subdomain. I can't set any TXT records in Linode DNS manager because the name servers for domain.com ...
0
votes
1answer
17 views

Precedence/co-existence of SPF and DKIM

Is co-existence of SPF and DKIM specified somewhere (assuming the absence of DMARC)? I want to put only my own IPs in the SPF and let 3rd parties send mail on behalf of my domain using DKIM. What ...
1
vote
1answer
27 views

spf and dkim records in the same dns zone file

I am trying to set up a mail server which will sign outgoing messages with a dkim signature. Part of that process is to set up a dns record for my senders domain with the public key of the key used ...
1
vote
2answers
58 views

SPF/DKIM Configuration for usage with critsend

I am currently facing the following issue: I have configured a domain of mine to be used with the Critsend mailing service. Their recommended configuration for both SPF and DKIM was implemented on ...
0
votes
2answers
46 views

Email flagget as spam or rejected by recipient mail server

I have configured smtp service on a windows 2008 server. All the emails sent by the smtp service are flagged as spam or they are rejected by the recipient of the email. In the header of the email I ...
0
votes
2answers
38 views

Should DKIM selector names be unguessable?

The M³WAAG DKIM Key Rotation Best Practices document (pdf) recommends a "sufficiently" random DKIM selector name so that it cannot be guessed by browsing the DNS. A literal quotation: 4.3 Key ...
0
votes
2answers
27 views

Marking emails with DKIM - safe?

Im running an email server as part of a research study. We have subjects connecting and sending email from a variety of clients. One function of this server is to communicate with said subjects - ...
0
votes
1answer
20 views

How sendgrid assigning its DKIM keys when we send email from application

I was exploring about DKIM. I read an email which was sent via sendgrid and with application from remote server. My question is , how can assign the DKIM key of own server if sender id do not exist in ...
0
votes
0answers
16 views

OpenDKIM: no MTA name match (host=myhost.mydomain.com, MTA=myhost.mydomain.com)

i'm using OpenDKIM together with Postfix MTA and while DKIM solutions is working well but in /var/log/mail.log i can see opendkim is complaining about OpenDKIM: no MTA name match ...
2
votes
1answer
63 views

Publishing long domain key records in bind9

I am setting up a mail system based on exim4. This system implements DKIM signing and checking (among other things). Signing seems to work without problems but checking doesn't work and exim4 ...
0
votes
1answer
49 views

opendkim requires libcrypto [duplicate]

I am trying to install opendkim. For that, I used rpm to install epel, then did yum install opendkim. However, I get the following dependency errors: Error: Package: opendkim-2.9.0-2.el6.x86_64 ...
0
votes
2answers
440 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 ...
2
votes
1answer
36 views

When creating DomainKeys does it matter if I use o=~ or o=-?

I used this utility to create my DKIM key (1024 bit size), since Gmail has been blocking us (we had an old joomla install exploited, was around before me). And I got this back: Your Selector Record: ...
7
votes
4answers
3k views

Getting Exchange to do DKIM

Having read Jeff's blog post about Email and DKIM, I'm thinking it might be good to DKIM all mail coming out of our Exchange 2003 servers. Whats a good way of going about that?
0
votes
1answer
122 views

Domain Key not showing up in DNS query

*SOLVED - See bottom of this post * So problem here is that I have been trying to set up a domain key for several days. I've done it successfully in the past, but I just can't get it to work this ...
1
vote
1answer
105 views

opendkim incoming not verified

I've installed opendkim with postfix on Debian Wheezy. Outgoing mail is getting DKIM signatures. The smtpd and non-smtpd milter spec is the same. Incoming mail seems not to be verified - in a ...
21
votes
4answers
8k views

DKIM sign outgoing mail from any domain (with Postfix and Ubuntu)

I got DKIM setup on my mail server (postfix and ubuntu) so it signs outgoing emails. I used these instructions: https://help.ubuntu.com/community/Postfix/DKIM However, I need it to sign emails from ...
0
votes
1answer
214 views

How to correctly configure postfix and opendkim and let receiving server know all details mailed-by signed-by?

What I am trying to achieve - Bottomline: mails to go in inbox rather spam folder. I have a server which is running postfix (mail server) and I have 3 domains. Mail server is used for both incoming ...
0
votes
1answer
28 views

Will setting up DKIM on Google Apps interfere with mail sent from the web server using the same domain name

I would like to set up DKIM on my domain for messages sent using Google Apps. I understand how to do this but I am concerned that if I have a DKIM DNS record for the domain, messages sent from the ...
0
votes
2answers
152 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 ...
0
votes
1answer
40 views

What to look for when using a 3rd party Email Enrichment Service - to secure our emails? [closed]

Our marketing team wants to use a 3rd party Email Enrichment Service. I want to try and tackle this, as I don't like the idea that my mail will go through a certified service and exposed. I know ...
1
vote
0answers
34 views

Whose DKIM signature to use, my own or Amazon SES'?

I have OpenDKIM properly set up to sign emails from my domain such that when sent through Amazon SES, Yahoo Mail shows dkim=pass. Given I got the infrastructure working, is there any benefit to ...
0
votes
1answer
14 views

Domain Key Entries

More BIND DNS questions. OK, my changes the the zone files are no propagating out. Now I'm having a problem with the domain key entries I'm trying to create. I'm starting by trying to set the domain ...
1
vote
0answers
120 views

postfix opendkim DKIM-Signature and Domainkey-Signature

Running postfix on CentOS 6 as an edge relay for a while now, so all our outgoing mail is routed through one point with opendkim signing the mail. This works great. I was originally using ...
0
votes
1answer
183 views

Configuring SPF, DKIM, Reverse DNS for VPS sending email through Google Apps SMTP servers

Today we realized that all of our emails being sent to email addresses of the type <username>@corporatedomain.com were getting rejected. I don't know who is hosting the email for ...
4
votes
1answer
2k views

Remove “via” from emails sent to Gmail from Amazon SES

When sending emails from Amazon SES, gmail shows "sent via amazonses.com". How do I remove this? According to Google, I'm a sender and I don't want my recipients to see the "via" link. What can I ...
0
votes
1answer
239 views

Configure postfix to DKIM-sign emails generated from the system

My web hosting server features a Postfix setup up and running. That postfix is also open with STARTTLS on port 587 for authorized users (only me, myself and I right now) to send emails to any domain ...
6
votes
4answers
690 views

Why does my mail get marked as spam?

I Have the server "afspraakmanager.be". It matches everything not to be a spam server.(it isn't by the way): it has reverse dns, spf,dkim,... . But hotmail marks it as spam. I think the problem is ...
0
votes
0answers
125 views

OpenDKIM - verifying mail forwarded by mailing lists

I'm using OpenDKIM for verifying signed mails that are incoming to my mail server and use it as a spam addon (if dkim is broken, mail lands in Junk). However, I'm getting lot of false-positives with ...
1
vote
2answers
221 views

How do I make Yahoo recognise my DKIM keys as DomainKeys

My outbound email is working correctly with DKIM, and I"d like to thet the lock icon next for my yahoo recipients. Since DKIM is the new DomainKeys, what can I do to enable what seems to be a ...
0
votes
2answers
3k views

Yahoo flagging mail as spam when using relay server

I'm using Postfix to relay mail from my site to my mail server. Mail is received properly at my Gmail and Hotmail accounts - only Yahoo is the problem. The Yahoo mail headers state: Received-SPF: ...
1
vote
3answers
625 views

Transactional Emails from my server goes directly to Spam folder of users in Yahoo

I am trying to setup our website portal to send registration confirmation emails to customers who sign up (its a simple message containing a link that confirms the email of the user). Everything is ...
0
votes
1answer
954 views

DKIM passes everywhere apart from Yahoo!

I'm using dkim-milter, Postfix on Ubuntu (I think I used these instructions for setting up). Anyway, using the reflectors such as Port25, BlackOps and Altn.com I get passes for DKIM: X-DKIM: OpenDKIM ...
0
votes
2answers
221 views

Yahoo is sending our server's transactional email to the Spam folder, even though we have set up SPF and DKIM

Yahoo Mail is sending our server's transactional emails to the Spam folder, even though we have taken quite a few anti-spam steps. By contrast, Gmail allows the messages through to the inbox just ...
1
vote
0answers
96 views

Postfix + Amavisd-new as smtp-proxy (pre-queue) for inbound only, postqueue for outbound?

I am in the planning phase of building a mailserver with the following requirements relevant to my question: Use postfix, virtual users (two virtual domains) Must filter pre-queue to reject ...
4
votes
1answer
70 views

Designating A DKIM Signer Other Than The “From” Domain

A few months ago, I implemented SPF/DKIM/DMARC for my three-person company. After a trial period, I switched our DMARC to "p=reject", so that emails are rejected if they fail SPF/DKIM. Generally, it ...
1
vote
1answer
66 views

Mails marked as spam in gmail for some accounts

I have a couple of domains running on my VPS with VirtualMin. I have DKIM enabled, reverse DNS is setup and SPF records are added by Virtualmin. Now I have a main account (admin) which I can easily ...
4
votes
3answers
2k views

Why is my email failing Gmail's DKIM test?

I have a message that was rejected by Gmail, I don't know why. It passes SPF. We aren't using DKIM. Do I need to set up DKIM? I am in control of "example.com". Our mail server is "server.example.com" ...
0
votes
0answers
92 views

Sending on behalf of with authorized email as envelope but from email to be client email

We would like to use configuration as mailchimp and constant contact use. We would like all the envelopes to be signed with our DKIM but to show that from email is from our clients email address. How ...