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Questions tagged [domainkeys]

44 questions
26
votes
7 answers

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 large key (with implied larger encoded size) and…
makerofthings7
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11
votes
2 answers

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@port25.com. This is the…
entropid
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10
votes
2 answers

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 complications. However, consider the following…
Belmin Fernandez
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8
votes
3 answers

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-Signature: v=1; a=rsa-sha256; c=simple/simple;…
NinjaCat
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7
votes
4 answers

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?
codeulike
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6
votes
2 answers

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 think there is a single standard for where to find…
coolaj86
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6
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2 answers

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: I am currently on a server running CentOS and…
Saif Bechan
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5
votes
1 answer

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: default._domainkey.example.com IN…
hardbizkit
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5
votes
5 answers

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 mails, when we tried to send promotional mails…
kris
4
votes
1 answer

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 record in my DNS for the domain I'm trying to…
Skittles
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4
votes
1 answer

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 online documentation recommends compiling Exim…
ensnare
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4
votes
1 answer

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-Signature: headers being generated, but a test mailer…
Ian
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4
votes
2 answers

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?
Daniel
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3
votes
1 answer

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 and outgoing mails.. I am signing with opendkim and…
Keval Domadia
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3
votes
3 answers

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 giltgroupe.bounce.ed10.net signed-by giltgroupe.com My…
Lashae
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