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 ...

learn more… | top users | synonyms

0
votes
0answers
25 views

DKIM errors in an nontransparent system

We have a client who has their mail hosted using a local exchange and POP3 connector's to their head office, and we only have access up to the POP3 connectors. This client hasn't been receiving all ...
0
votes
1answer
50 views

Mails going to spam. Please see the details [duplicate]

My hostname is properly set up. Host file has proper entries. Mail header shows SPF pass. IP is not balcklisted. Mail body is also fine. Only thing don't have is DKIM setup. Now I have got two ...
0
votes
1answer
27 views

DKIM wrong selector / domain

We're having an hard time setting the DKIM record for our sender domain. I'll get into more details: We have a valid key (check) for a sending subdomain (email.mydomain.com) with selector ESP1024 In ...
0
votes
1answer
43 views

How to setup Postfix with Opendkim to automatically sign PHP emails?

I've found that: submitted emails are signed properly (ie those sent with MUA's like Outlook and Thunderbird) command-line sent emails are signed properly emails sent with PHP, in particular case ...
-3
votes
0answers
19 views

Mails received in spam although server removed from blacklist [duplicate]

a server was blacklisted because it was used to send spam, I requested it to be removed from blacklists, I rechecked it at serveral blacklist it wasn't blacklisted, yet when mail is sent, it goes into ...
0
votes
1answer
29 views

Have Postfix/OpenDKIM sign only authenticated and local origins

I'm signing email just fine, but I don't want to sign relayed email when the "From" address is one of the domains I'm signing. What's the right way to configure Postfix/OpenDKIM to sign only from ...
0
votes
2answers
36 views

Error sending emails from a mail server relay type falling into the spam folder (using postfix)

Here I show one of the emails that come to Yahoo, which are falling directly into SPAM folder. The SPF goes smoothly, the DKIM passes without problem, even DMARK passes without problem, but just keep ...
4
votes
3answers
84 views

Will mailing lists “break” if SPF is too restrictive?

I have recently configured my own mail server (Linux-based postfix + dovecot scenario). This is just for personal use - I have no bulk mail going out, no automatically generated mail outbound from the ...
3
votes
2answers
52 views

Is there anything bad about DKIM-signing mail without the key in DNS?

At a site that I manage, we send out emails for many customer domains. Some of them have our DKIM key in DNS, some don't. From what I can tell: Signature verification failure does not force ...
1
vote
0answers
29 views

Sign with one DKIM key for all subdomains [duplicate]

I've set up DKIM key for primary domain as per this tutorial: http://askubuntu.com/questions/134725/setup-dkim-domainkeys-for-ubuntu-postfix-and-mailman Can I use the same key to sign for subdomains ...
0
votes
0answers
26 views

Postfix+DKIM using Amazon's second private IP address

I use Amazon EC2 with 2 private IPs. I have 2 postfix instances (using multi-instance builtin support) with opendkim. Each instance works when I send email (over telnet) using the primary private IP ...
0
votes
1answer
59 views

DMARC is blocking email that seems like it should be allowed

This is the DMARC record we have set v=DMARC1; p=reject; rua=mailto:[redacted]@coinbase.com; adkim=r; aspf=s So we are rejecting any not match with SPF strictly, and DKIM is relaxed. Here is the ...
1
vote
2answers
175 views

Postfix sends email to spam (gmail, hotmail)

I recently installed a postfix + dovecot + dkim multi domain, multi user, multi alias mail server on my debian squeeze system. Everything works except for one big issue that basically makes the whole ...
1
vote
3answers
44 views

Is it safe to use port25 to generate DKIM key

I found this site. But if I use it, doesn't it mean that port25.com would know and be able to use my private key?
0
votes
0answers
47 views

How to prevent emails from my domain through mailing lists to be rejected due to DMARC

I operate my own mail server at speedofsoundgaming.com and mwtd.net. I recently added a DMARC record to my domain to help prevent spam, and once seeing that things seemed to be working, upped the ...
0
votes
0answers
45 views

DKIM missing if url without www. (Plesk / Amazon SES)

I'm trying to setup verification for Amazon SES. My server is using lates PLESK ( linux). If I use my domain with www. DKIM keys will show. But when I try without www it says that it cannot verify my ...
0
votes
0answers
37 views

AWS Linux/Sendmail/dkim-milter — how to troubleshoot?

I'm trying to get Sendmail to use dkim-milter on an AWS Linux instance (similar to RHEL/Centos). I've been trying to use these directions, which are a bit out of date, but which seem to work: ...
-2
votes
2answers
50 views

DKIM do I need to allow port 8891 on my firewall?

I'm trying to set up dkim on my server so my emails are less likely to end up in my customers' spam. Quick question: does port 8891 need to be opened? I'm using ufw. Many thanks in advance,
0
votes
0answers
24 views

spamassassin not loading DKIM module

I kept noticing SA 3.3.1 giving DKIM invalid even though my webmail system performs an additional check using OpenDKIM that does return valid for some. I ran sa-update -D and got this: module not ...
1
vote
5answers
187 views

What domain name should appear in a DKIM signature?

I followed these instructions to setup OpenDKIM with Postfix, and it works as advertised. My outgoing mails have the DKIM-Signature header added, for example: DKIM-Signature: v=1; a=rsa-sha256; ...
0
votes
0answers
105 views

Cannot verify DKIM signature: pubkey_unavailable

Ok this one is new for me. I get an error looking like this. Apr 27 17:00:46 powerplant postfix/smtp[2695]: E614FC0867: to=<****@***>, orig_to=<wood@*****>, ...
2
votes
1answer
516 views

Exim doesn't want to do DKIM signing correctly

I'm using exim 4.82 on Debian sid. I've followed several tutorials on how to configure exim to sign outgoing emails, but it seems like something is not behaving as it should be. My diagnosis is that ...
0
votes
1answer
29 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
10 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=; ...
0
votes
0answers
105 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 ...
1
vote
0answers
74 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, ...
5
votes
1answer
348 views

DKIM and SPF for a subdomain

I manage a VPS on Linode accessed through subdomain.example.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 example.com ...
0
votes
1answer
19 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
44 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
97 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
73 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
74 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
32 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
63 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
60 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
258 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
119 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 ...
2
votes
3answers
1k 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 ...
2
votes
1answer
56 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: ...
0
votes
1answer
630 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
403 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 ...
0
votes
1answer
43 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
1answer
45 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 ...
0
votes
1answer
495 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 ...
1
vote
1answer
72 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
16 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
275 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
383 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 ...
6
votes
4answers
991 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
1answer
205 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 ...