Questions tagged [domainkeys]

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Softfail on forwarded emails sent through Yahoo mail - Is there a fix?

happy to be here. Excuse me for the wall of text but I am trying to help a friend who wants to keep on using his Yahoo mail for sending emails from his business email address. His mail server is on ...
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1 vote
1 answer
250 views

Emails not adding DKIM signature: Milter service - Connection refused [closed]

I have generated and added a DKIM record with a selector: 2020. The DKIM record seems to have been added successfully when I used a few DKIM checkers online but GMAIL (mailed-by is displayed whereas ...
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  • 169
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1 answer
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Is it as dangerous to modify DKIM domain's public key, as to get a domains' sending private keys?

I've been reading about DKIM and one of the reasons it cannot be "hacked" is because an attacker doesn't have access to a server's DKIM private key. But what if the attacker has access to the domain'...
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  • 139
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1 answer
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DKIM key length causing failed validation?

I setup a DKIM record where I had to break up the value because it exceeded the 255 character length limitation. But now I see that online checkers are complaining about the p= not being base64 ...
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  • 609
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1 answer
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Difference between DKIM and DomainKeys

There are two methods for signing mail out there (DKIM and DomainKeys). While some sources say that DomainKeys are "ancient", others say you need both, even though to my understanding they do almost ...
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1 answer
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SPF, DKIM, DMARC, DomainKeys OK, emails flagged as SPAM [closed]

I have a new dedicated server running CentOS7 with Plesk 12.5 with postfix, and i have succesfully set SPF, DKIM, DMARC and DomainKeys as it shows this test from port25.com: ==========================...
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6 votes
2 answers
5k views

What is the significance of _domainkey.foo.com prefixes? (pic, mailo, k1, etc)

I notice that every time I set up google apps, mailgun, mandrill or whatever I always have to set up domainkeys. That part makes sense - RSA, public/private, etc - I get that. Intuitively I would ...
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5 votes
1 answer
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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: ...
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3 votes
1 answer
9k 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 ...
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  • 587
2 votes
1 answer
729 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 dkim-filter/...
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  • 456
1 vote
1 answer
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Email Delivery to Gmail Breaks After Implementing DomainKey

I have a personal VPS that I use as a personal email and web server. Today I was diagnosing email, and I created a test account at Gmail. At first I was not implemented DomainKey and only SPF was ...
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11 votes
2 answers
5k views

Setting up DomainKeys

I've tried improving the security of my emails (and preventing them from being marked as spam) by adding the SPF and DKIM records. So I've created both of them and I tested the results with check-auth@...
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  • 265
1 vote
1 answer
9k 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 ...
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4 votes
1 answer
9k views

Amazon SES domain verification TXT DNS record

I currently am trying to get my domain verified on Amazon's SES and running int a problem that google searches are not helping me get any closer to solving. According to SES, I have to create a TXT ...
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1 vote
1 answer
204 views

DKIM for Email Service Provider clients

How would you go about implementing DKIM signing in this scenario? You have a service that allows customers to logon to your web application, create a newsletter, and send it to their subscribers ...
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2 votes
1 answer
3k views

Exim DKIM Error: DKIM: signing failed (RC -101) no matter what private key I try

I have this problem with Exim. DKIM fails on signing outgoing mails. This is the /var/log/exim4/mainlog output (Debian Squeeze): 2012-08-02 17:11:33 1Sx1k5-0004Tk-9D <= me@my_domain.com U=me P=...
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2 votes
1 answer
2k views

How to fix DKIM for mail on VPS hosting?

I have a hosted VPS that is fully managed by the hosting company. For weeks they cannot figure out how to get DKIM working for my emails, even though in cPanel's Email Authentication section says DKIM ...
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2 votes
1 answer
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Qmail in Plesk is suddenly unable to send any message [closed]

I have a weird problem on Plesk 8.6 (CentOS 5.7). After a server restart, no mail gets delivered thru qmail. Neither to the local mailboxes nor to external addresses. All mail gets accepted, and no ...
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-1 votes
1 answer
368 views

Confused with Domainkeys. Help?

I generated a domain key for my domain at http://www.socketlabs.com/services/dkwiz and got the following two things generated. Generator Key1: Setting up Hurricane Server Edit the configuration for ...
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-1 votes
1 answer
734 views

qmail is returning all mails as "handlers permanentfail"

i am sending emails through php and qmail with SPF record and domainkeys on. but all emails are returned as handlers permanentfail. what is the problem?
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2 answers
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Getting started with DKIM / DomainKeys

I'm using WinServer to generate and send emails via my Goggle Apps-hosted domain (my SMTP server is smtp.gmail.com) . My registrar (Network Solutions) supports Text records - so I should be able to ...
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1 vote
2 answers
219 views

would this header cause the email to be flagged as suspect?

Authentication-Results: [snip].mail.[snip].[snip].com from=someDomain.com; domainkeys=neutral (no sig); from=someDomain.com; dkim=neutral (no sig) Received: from 127.0.0.1 (EHLO smtp1....
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  • 13
4 votes
1 answer
551 views

Sign outgoing mails with DomainKey on exim4 and Ubuntu

I just installed Exim 4.73 on Ubuntu using apt-get. I was able to easily integrate DKIM signing because of it's integration with Exim. I'm having some trouble with DomainKeys support. Most of the ...
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1 vote
2 answers
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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 ...
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25 votes
7 answers
50k views

How do I enter a strong (long) DKIM key into DNS?

I'm trying to enter a 4028 bit DKIM key into DNS and it seems that I'm exceeding both the UDP 512 byte limit and also the maximum record size for a TXT record. How does someone properly create a ...
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0 votes
2 answers
3k views

Gmail uses both DKIM and DomainKeys, while Hotmail uses none?

I noticed that Gmail messages have both a DKIM-Signature header and a DomainKey-Signature header, while Hotmail messages have none. What is the purpose of using both DKIM and DomainKey signatures, as ...
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1 vote
1 answer
2k views

signing multiple domains with dk-milter

How can I sign multiple domains using dk-milter so that each domain would have it's own different domainkeys signature. I've already done this for DKIM using openDKIM (http://stevejenkins.com/blog/...
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9 votes
2 answers
8k views

SPF hardfail and DKIM failure when recipient has e-mail forwarding

I configured hardfail SPF for my domain and DKIM message signing on my SMTP server. Since this is the only SMTP server that should be used for outgoing mail from my domain, I didn't foresee any ...
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1 vote
1 answer
6k views

How to get DKIM to authenticate?

I've got sednamil, dkim-milter both running on RHEL4. DNS and config files look like: TXT record: mail._domainkey.MYDOMAIN.com IN TXT "v=DKIM1; g=*; k=rsa; t=y; p=....snip...TRM3w7CuYnQIDAQAB" ...
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  • 576
8 votes
3 answers
3k views

DKIM vs Domain Keys

I've configured DKIM (milter-dkim) on my mail server. Incoming e-mail sent from my domain now containts the following header: X-DKIM: Sendmail DKIM Filter v2.8.3 MYDOMAIN.com o7FLH1Wa032083 DKIM-...
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  • 576
5 votes
5 answers
1k views

SMTP server, SPF records, domainkeys

Recently we have setup a new SMTP server to send newsletters and promotional mails to our registered users. There are 5000 users who will receive newsletters on weekly basis. We are getting bounced ...
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3 votes
3 answers
2k views

Sign multiple domains with single Domain Key (dk-filter)

Motivation The private shopping website GILT, send periodical update emails from giltgroupe.bounce.ed10.net however all of the mails are signed with domain keys of giltgroupe.com. mailed-by ...
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2 votes
2 answers
427 views

I installed DKIM and SPF. Do I need to install Domain Keys as well?

I have linux apache mysql and php server. My website uses the php mail() function and the server's postfix server to email other people. I successfully installed SPF and DKIM on my server to reduce ...
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0 votes
2 answers
4k 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: ...
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7 votes
4 answers
14k 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?
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1 vote
1 answer
606 views

What are the right reverse PTR, domain keys, and SPF settings for two domains running the same application?

I just read Jeff Atwood's recent post on DNS configuration for email and decided to give it a go on my application. I have a web-app that runs on one server under two different IPs and domain names, ...
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6 votes
2 answers
1k views

What are DNS TXT records and why are they needed

I am creating a server with a primary nameserver and mutliple domains. Do i need to make TXT records for all the domain, they all have there own email, but use the mailserver from the primary. EDIT: ...
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4 votes
2 answers
178 views

Email Server Validation Website

When sending emails I want my server to have DomainKeys and SPF records setup records correctly, is there a website I can email that does validation of my DomainKeys and SPF records?
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  • 3,751
2 votes
1 answer
203 views

When sending emails through smtp do I need to setup DomainKeys and any kind of other email config?

When sending emails through gmails smtp (smtp.gmail.com) do I need to setup DomainKeys and any other kind of email config?
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  • 3,751
0 votes
1 answer
382 views

What would cause intermittent DomainKey-Status: failures?

Every week, we send something like a small newsletter. Sometimes, the header in the newsletter says DomainKey-Status: bad (test mode) Sometimes it says DomainKey-Status: good (test mode) All the ...
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2 votes
1 answer
1k views

Yahoo marked my mail as spam and says domainkey fails

Yahoo is marking our mail as spam. We are using PHP Zend framework to send the mail. Mail header says that Domain Key is failed. Authentication-Results: mta160.mail.in.yahoo.com from=mydomain.com; ...
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2 votes
3 answers
4k views

Emails is marked as spam

Hi We have set up the DKIM in our mail server using sendmail and configured our DNS record also. Still our mails are marked as spam. Also when we sent the mail from outlook the domainkey ...
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0 votes
2 answers
140 views

DomainKeys options for multiple mailers

I want to setup Domain Key signatures for outbound mailers (postfix). I am currently using dkimproxy but I would need to setup one instance per postfix which is too many. Is there software that will ...
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  • 375
4 votes
1 answer
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Yahoo Domain Keys setup, getting dkim=permerror (no key)

I'm working on getting DKIM installed on my outgoing mail server, to help my email deliverability to my Yahoo clients (all legit emails, etc, no spamming). I've got DKIM-Signature: and DomainKey-...
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  • 1,468