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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3
votes
2answers
356 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 ...
1
vote
2answers
481 views

How do I use an include statement in a TXT record?

We have a client that is using an email service that requires a TXT domain key reocrd that is over 127 characters long. I'm pretty sure BIND allows this, however we run djbdns with tinydns and it ...
0
votes
2answers
345 views

Exim4 doesn't add DKIM signatures

I cannot overcome a problem with exim - it's not adding DKIM headers to my outgoing mail. support:~# cat /etc/issue Debian GNU/Linux 7 \n \l support:~# dpkg -l|grep exim ii exim4 ...
0
votes
2answers
320 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 ...
8
votes
1answer
662 views

Exim 4.71 does not add DKIM signature to outgoing emails

I am trying to add DKIM to my domain, I have created a key, added the following to /etc/exim4/conf.d/transport/30_exim4_config_remote_smtp: dkim_domain = mydomain.com dkim_selector = mail1 ...
2
votes
1answer
415 views

Hotmail/Outlook.com DKIM failure when signing with different domain - header.d ignored

We (sender.org) provide a mail server for a client (example.org) and sign outgoing messages with our private DKIM key (we cannot change the signing domain to the client's domain). Return-Path: ...
1
vote
1answer
120 views

OpenDKIM not signing outgoing mail

I'm trying to setup OpenDKIM on my mailserver running Debian and Postfix. This is the configuration I've done: Generated two keys (for two domains I need to send mail for) Configured KeyTable, ...
1
vote
1answer
38 views

Debian, DKIM and Exim4 never returns public key

i wanted to use DKIM in an exam mailserver on debian. My DNS settings are: @ IN TXT "v=spf1 mx -all" 27564764._domainkey.example.com IN TXT "v=DKIM1; k=rsa; ...
1
vote
1answer
325 views

DKIM Signing not working, amavisd indicates that is passes

amavisd-new testkeys indicates a pass, but mailtest@unlocktheinbox.com says that my DKIM signature could not be found? Anyone ran into this before? Anyone got any easy ways to set up DKIM signing? ...
1
vote
1answer
283 views

DKIM failure when using Exim4 as an “edge transport” for Exchange 2010

I have a server running Exim 4.72 that is set up similar to the Exchange "Edge Transport" role: it forwards mail from the internet to Exchange and forwards mail from exchange to the internet. I ...
0
votes
1answer
10 views

Local mail not signed, Postfix, DKIM, Mandrill

I am running a Postfix mail server for my client. Mail is relayed through Mandrill. Mandrill requires a valid DKIM signature. This works all right for relayed mail. That is, mail sent through ...
0
votes
1answer
41 views

DKIM signature and hmailserver - Your DKIM signature is not valid

I'm trying to get DKIM working on a domain using hmailserver as the mailserver, but I keep on getting Your DKIM signature is not valid This is from www.mail-tester.com The DKIM signature of your ...
0
votes
1answer
32 views

Two DKIM signatures in outgoing messages

I have DKIM and SPF correctly configured on my server with postfix (myserver.com). However, when I send emails from Gmail configured to authenticate and send email as myname@myserver.com ...
0
votes
1answer
50 views

Amazon SES DKIM signing with Route 53 issue

I had DKIM signing setup and working fine for my example.com for years. But recently i moved my DNS to amazon Route 53 and added all records there, including the CNames that was previously with the ...
0
votes
1answer
400 views

Route53 DNS and DKIM/TXT

I've been trying to set an openDKIM public key as a TXT record within the Route53 hosted zone for my domain. The record is mail._domainkey .zewtie.io but, however I enter the public key in the ...
0
votes
1answer
81 views

Partial DKIM pitfalls?

We've recently implemented DKIM for automated emails sent out from our website (SMTP on static IP). However we cannot implement DKIM for our hosted exchange email accounts (managed hosting sends from ...
0
votes
1answer
474 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
1answer
31 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
votes
1answer
518 views

Debian Unstable + Postfix 2.6.5 + dkim-filter 2.8.2 issue

I have Postfix installed on Debian Unstable, as the title states, the system is completely up-to-date, I have tried to get DKIM signatures working on outgoing mail using dkim-filter 2.8.2. I couldn't ...
2
votes
0answers
77 views

Deprecation of RSA-SHA-1 in DKIM keys?

I recently noticed that opendkim on my mail server is objecting to DKIM signatures from a client, saying their key is insecure. It may be that that's due to lack of secure DNS (confirmation?) but I ...
1
vote
0answers
24 views

Unable to query DKIM because of DNS timeout

I run dkimproxy to sign outbound email and verify inbound email. Since a while, I am experiencing the following permanent problem. The dkimproxy service is unable to query the DNS. Each and every ...
1
vote
0answers
24 views

How do I use SRS rewrite the From header on a forwarded email message

I have a serious problem here. I run a labor dispatch website, where users can register their cell phones (I send them an auth code via text, they enter it at the website, it's entirely opt-in). A job ...
1
vote
0answers
70 views

Sendmail refuses to sign messages with DKIM provided by opendkim

I have sendmail and opendkim installed on ubuntu 14.04 and would like to configure DKIM. Unfortunately sendmail refuses to sign outgoing emails with DKIM. Despite the fact that it already did ...
1
vote
0answers
18 views

DKIM verification in exim4

I'm confused about the acl_smtp_dkim. In my main config I have # DKIM verification on rcpt. acl_smtp_dkim = acl_check_dkim domainlist require_dkim_signed_mail_domains = gmail.com:paypal.com ...
1
vote
0answers
24 views

Setting DKIM and SPF records for client domains

I have created an email server that is capable of handling mail for multiple websites. e.g. tom@website1.com, tom@website2.com etc. The emails are sending and receiving fine, but the spam score is ...
1
vote
0answers
35 views

SpamAssassin : main.cf score if test not passed / not defined

I can set scores influences for different test passed in main.cf for spamassassin. Like if I set this variable : score URIBL_BLOCKED (3.5) This means that if mail marked is URIBL_BLOCKED for ...
1
vote
0answers
302 views

Exim mail not signing DKIM. Don't find whats wrong. (detailed description of steps taken)

I'd like to setup my fresh server (ubuntu) for hosting my www.bolleboos.be website and enable sending of email from my php scripts. So... I installed apache, php, mysql, ... and for the mail exim4 ...
1
vote
0answers
520 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 ...
1
vote
0answers
303 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 ...
1
vote
0answers
556 views

Not Connecting from my zimbra webmail

I have configured zimbra webmail on centos 5.5 64bit server for e-mail authentication. I have installed DKIM and dk-filter on it after installation to check authentication. I tried to open zimbra by ...
0
votes
0answers
5 views

exim4 dkim only signing emails from root

I have set up exim4 on my raspberry pi, and configured exim to sign emails with dkim. This works perfectly when an email is sent from "root@mydomain.com", but when I send an email from any user other ...
0
votes
0answers
55 views

dkim=temperror at hotmail and dkim=pass at gmail

When i send emails to hotmail, i get dkim=temperror. However, my dkim records are good as checked by gmail. At hotmail, i get also spf=pass, X-AUTH-Result: PASS, X-SID-Result: PASS 7 days ago, i ...
0
votes
0answers
22 views

Debugging dkim=fail using sendmail+dkim-milter

I'm setting up a CentOS server with the sendmail MTA to send DKIM-signed mail (sending domain is @brighter.do). I have succeeded in routing mails through the dkim milter; however, they arrive at my ...
0
votes
0answers
82 views

How to send DKIM signed email with PHP Mail

I'm using Cacti and the PHP mail option. I want to sign my emails with DKIM I have setup rsa key, signatures, and keytable with opendkim. Opendkim conf which I added to is below taken from a tutorial. ...
0
votes
0answers
114 views

DKIM fail signature doesnt verify

I had setup postfix and dkim and keep on getting dkim=fail on port25 and gmail checks. DKIM check details: Result: fail (signature doesn't verify) ID(s) verified: Canonicalized Headers: ...
0
votes
0answers
110 views

DKIM, SPF, DMARC, SPF OK mails are flagged as SPAM

I have a dedicated server running CentOS7 with Postfix, the problem is that all the sent mails are flagged as SPAM by hotmail and gmail despite DKIM, SPF, DomainKeys, DMARC records and keys wich are ...
0
votes
0answers
598 views

DKIM-verification fails because of “insecure key”

I have my Debian (7.9 "wheezy") E-Mail-server (Postfix 2.9.6-2) setup to sign and verify DKIM signatures in e-mail messages using OpenDKIM (version 2.6.8-4). When I send myself an e-mail from my ...
0
votes
0answers
769 views

Configure SPF for gmail account

I am really new to this @ v=spf1 include:_spf.google.com ~all 1 Hour I have added the above spf setting for admin@studentclutter.com as it is a google apps email account However, I am getting ...
0
votes
0answers
665 views

new dkim config -> opendkim-testkey: record not found

I am trying to set up dkim and I cannot get it to work or test properly, and I get the following error: opendkim-testkey -vvvv -d domain.com -s default opendkim-testkey: checking key ...