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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2answers
207 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 ...
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2answers
1k 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 ...
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2answers
449 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 ...
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2answers
284 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 ...
6
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1answer
271 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 ...
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1answer
274 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? ...
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1answer
265 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 ...
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1answer
42 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 ...
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1answer
124 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
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1answer
232 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 ...
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1answer
26 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 ...
0
votes
1answer
464 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 ...
0
votes
1answer
606 views

named.conf to include zone file and opendkim conf

I would like to separate out opendkim default.txt from zone file and to be include in named.conf instead. I'm a little bit confused on which approach I should use and which is the correct one. ...
-1
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1answer
507 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 ...
4
votes
0answers
509 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
0answers
40 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
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0answers
110 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 ...
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0answers
200 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
0answers
411 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
239 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
400 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
10 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 ...
0
votes
0answers
223 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 ...
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votes
0answers
99 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 ...
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votes
0answers
220 views

AmazonSES + DKIM + Hotmail = temperror

Although SPF is passing, I'm getting a dkim=temperror on hotmail only (it's working on Yahoo and Gmail). I'm using AmazonSES, and already have the proper CNAMES for DKIM signing on my domain at ...
0
votes
0answers
247 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 ...
0
votes
0answers
117 views

DKIM error - no key

Im using PowerMTA and trying to get dkim to work. Im using godaddy DNS. Gmail is giving me : dkim=neutral (no key for signature) header.i=@ same thing with yahoo: permerror(no key) dig output: ...
0
votes
0answers
330 views

EXIM4 sent mail sometimes rejected, always put in spam. DKIM and SPF pass + reverse DNS

Recently I've been seeing some instances of Your access to this mail system has been rejected due to the sending MTA's poor reputation. in my maillog and have noticed that my emails have been getting ...