All Questions
171
questions
1
vote
1
answer
117
views
Understanding DMARC report - DKIM pass on SPF fail
I am looking for some help understanding a DMARC report for my email server. The xml content looks like the following:
<?xml version="1.0" encoding="UTF-8" ?>
<feedback>...
- 13
0
votes
0
answers
47
views
How to add your own private keys to postfix configuration for DKIM without opendkim or the likes of it?
I have generated the keys locally through openssl added key.pub to the DKIM DNS txt Record but how to add it to postfix withouth any other tool.Is there any connfiguration parameter where the file ...
0
votes
0
answers
83
views
Your DKIM signature is not valid - opendkim
I'm running postfix server with few "features" like spf, dmarc and DKIM. SPF and DMARC works fine and when I sent an email to my gmail account I see they PASS, however DKIM shows "FAIL&...
- 101
0
votes
2
answers
391
views
Forwarding email message breaks DKIM
I have problem with postfix, DKIM and forwarding messages. In almost every article about DKIM I’m reading that “if I do not modify any fields in message header, DKIM signature should still be valid ...
- 501
2
votes
2
answers
801
views
Add Multiple Subdomains In Signing Table And Key Table Opendkim
I need some major help adding multiple subdomains in the signing table and key table for opendkim without listing them one by one.
If I have 50 subdomains I want to add, it will take me forever.
I am ...
0
votes
0
answers
145
views
Is possible to use a DKIM-Proxy to signing emails requested from another application?
I using an application to send emails, written in golang which use net/smtp as SMTP Libary, however that lib provide no support with DKIM signing, but using a sendmail command, for example, the DKIM ...
0
votes
0
answers
56
views
What is behaviour of opendkim while verifying an email with multiple dkim signatures?
I am trying to implement DKIM verification using Opendkim and postfix. The doubt I am struck by is what will happen if the email has more than one DKIM signature and one of them fails (as like failed ...
- 47
0
votes
0
answers
176
views
DMARC and Postfix delivery reports
I successfully set up DMARC, DKIM and SPF for my mailserver's domain, but delivery reports created by Postfix fail the DKIM/SPF tests.
The headers of regular messages (sent via my mailserver) look ...
- 267
3
votes
1
answer
519
views
How to make postfix sign non-delivery notifications with DKIM?
I have set up my "postfix" server to sign outgoing messages with DKIM and verified that it works correctly for SMTP users using authentication. However, "non-delivery notifications"...
- 33
0
votes
1
answer
1k
views
Postfix - can't send emails to gmail addresses via terminal
I have the following errors when trying to send emails to gmail addresses via my terminal:
sudo tail /var/log/mail.log
Jul 19 13:19:44 ubuntu-4gb-fsn1-1 postfix/cleanup[5780]: B4B8C5F4A3: message-id=&...
- 101
0
votes
1
answer
99
views
OpenDkim - PHPMailer - Failure OpenDkim
my dkim configuration was working just fine. Im working with an email marketing app, pretty simple, normally i used to send the campaign with a Sender ID that is my domain company, and for the From ...
1
vote
2
answers
3k
views
Why does DMARC fail for forwarded emails from this particular domain when it passes for all other domains?
I run a virtual mail server that forwards emails to my domain to a Gmail address, and I use PostSRSd to rewrite the addresses. For example, if someone sends an email to [email protected], my mail ...
- 365
0
votes
0
answers
379
views
postfix configuration to prevent bounces when relaying to 3rd party (e.g. src -> my@work -> my@gmail)
i have an active mail relay that is using aliases as a main tool,
at some point we started to get bounces for some emails.
Source: somerandomsenderdomain.com
Destination: myemaildomain.com
...
0
votes
3
answers
189
views
How to generate separate autoreply warning from postfix to senders not using DKIM?
Antispam/phish efforts with DKIM and SPF are weak if they're not widely enforced. I can't turn on strict no-DKIM rejection or emails will be lost, but there should be some penalty for domains not in ...
- 265
0
votes
1
answer
1k
views
How to correctly configure OpenDKIM with Postfix on Debian 11?
The desired settings are to create a multi domain mail server.
This is my main domain example.com and this is my subdomain: mail.example.com
Taking the rDNS as the following verifications:
hostname -f
...
- 101
1
vote
0
answers
99
views
Postfix: getting 50 or more copies of the same email from specific senders
I have a Postfix (2.10.1) / Dovecot server running on Centos 7. From specific servers I get about 50 copies of the same email every weekend, I tried a wireshark but it uses STARTTLS so its all ...
- 11
-2
votes
1
answer
3k
views
Could not connect to SMTP host
I have a VPS server
I have a postfix mail server running on that VPS server (I installed it via command line using a tutorial)
I have an SMTP server running on that VPS server
I also have the required ...
0
votes
1
answer
817
views
dkim key error with bind9 dns
I am having an issue while configuring dkim with postfix on ubuntu 20.04, as i get the following error:
opendkim-testkey -d example.com -s khloud -vvv
opendkim-testkey: using default configfile /etc/...
1
vote
0
answers
665
views
Why are my mails failling body hash verification?
Since a few weeks, mails sent via my mailserver at the-grue.de fail dkim authentification. That's very strange, because I'm not at all aware of any changes on my part...
mxtoolbox checked the mail, ...
0
votes
0
answers
176
views
postfix to gmail silent delivery failure
With the impending turndown of free hosted Google workspace accounts, I'm trying to install my own mail server using postfix/dovecot/opendkim. Mostly, it's working and for many of the services I've ...
- 131
0
votes
1
answer
2k
views
How can it be possible dkim fails whereas spf pass
I have set up a postfix which sends emails.
I have configure spf, dkim and dmarc (with p=none).
I have checked with mail-tester: spf and dkim work fine.
I have set up a dmarc rua in order to receive ...
- 429
0
votes
0
answers
217
views
Is the a Postfix milter supporting dkim with IDN and UTF8
I use postfix mailserver with enabled SMTPUTF8 and some IDNs, before I used IDNs I used OpenDKIM, but OpenDKIM crashes if I use the IDN in utf8 form. Then I tried pyopendkim. Then I tried dkimpy-...
user949712
5
votes
1
answer
964
views
Why doesn't dkim sign the letter?
I have configured DKIM:
Dec 27 11:10:03 mailer opendkim[378]: OpenDKIM Filter v2.11.0 starting (args: -x /etc/opendkim.conf)
Dec 27 11:10:10 mailer postfix/postfix-script[551]: warning: symlink leaves ...
- 161
1
vote
1
answer
553
views
Does Postfix add the DKIM header before or after a message is queued?
The Postfix configuration has been changed to add a DKIM header when sending a mail.
But Postfix is currently in the stop status, and mailq shows that new mails have been queuing in the meantime.
Will ...
- 5,646
2
votes
1
answer
3k
views
Is DKIM/ARC working properly on my Mailman server?
I've set up a Mailman 3 server with Postfix. I've configured Postfix to add DKIM headers using OpenDKIM and a test email from that server to a Microsoft-hosted email address suggests that DKIM is OK:
...
- 121
0
votes
0
answers
604
views
Incoming DKIM verfication check working but not rejecting
I have SPF, DMARC and DKIM configured for my mail server (postfix) on a CentOS 7 OS.
Outgoing mail is getting signed as normal. All email check sites says my stuff are secured and working great but ...
- 21
1
vote
2
answers
2k
views
How to get DKIM to sign for both, a subdomain and the root domain addresses?
I'm using latest versions of DKIM + Postfix on Ubuntu 20.04
I got the DKIM to sign the e-mails [email protected]. However it refuses to sign e-mails that originate from @mydomain.com. Is it ...
- 23
1
vote
1
answer
2k
views
DKIM seems to be working but I get " dkim=temperror (no key for signature) "
DKIM with Postfix on Ubuntu 20.04
part of the e-mail header as it arrives at my google mail account:
ARC-Authentication-Results: i=1; mx.google.com;
dkim=temperror (no key for signature) header....
- 23
6
votes
1
answer
2k
views
No DKIM headers in sent mails from postfix
I have two postfix, one for receiving mails and the other for sending mails, and I am having trouble signing dkim on my outgoing mails. I followed this tutorial.
Logs also is not helping me point to ...
- 161
0
votes
1
answer
438
views
DKIM Record Not Working
I was setup SPF, DKIM and DMARC Record for my mail server,
SPF and DMARC Record are working normally now,
But i got a problem for my DKIM Record,
When i do: dig default._domainkey.example.com txt
The ...
0
votes
0
answers
380
views
DKIM validation fails only on Outlook
I'm configuring OpenDKIM to sign miltiple domains with the same key on Pstfix. I followed this tutorial with s=mail and d=example.com.
SigningTable:
* mail._domainkey.example.com
KeyTable:
...
- 11
0
votes
2
answers
209
views
Postfix can't receive external mails since TLS has been set up
I have a postfix mail server with which I am able to :
send mails (to google for example) with the commande : "echo foo | mail -s 'bar' [email protected]"
send mails with php mail()
send and ...
1
vote
1
answer
3k
views
Forward messages to Gmail (postfix+SRS) has DMARC failure even though SPF and DKIM succeed
I run my own domain, but forward many email addresses to my gmail account. Recently, I started seeing a lot of messages marked by gmail as spam. I have SPF set for my outgoing email, and use SRS to ...
- 2,741
1
vote
1
answer
487
views
How to set Public Key DKIM in Postfix
I need to set up my public key in the postfix server, I already generated the keys in https://dkimcore.org/tools/, and added the TXT records in my DNS provider. But I have no idea how to set it in my ...
0
votes
2
answers
532
views
Email protected with SPF but received valid signature from other IP anyway
I've received an email in spam from [email protected] to [email protected], but the "sent by" came from rec15.appleandrdoidmail.mx. [email protected] is an alias. Weird thing is that it says ...
- 103
2
votes
1
answer
1k
views
OpenDKIM not signing but no error
I've set up opendkim (2.10) with postfix on an ubuntu 16.04 host. According to the logs, all is fine (i.e., no errors), but mail isn't being signed. I can see that postfix is passing messages to ...
- 445
1
vote
1
answer
1k
views
intermittent DKIM failure
We have several email servers that send out legitmate email via PostFix and use openDKIM.
Recently we've had some recievers claim the DKIM record can not be verified so we've tried various tools such ...
- 113
-1
votes
1
answer
275
views
Modifying date breaks DKIM signature. Alternatives?
On our Postfix server we previously removed the Date header from incoming emails and had Postfix automatically add it again to prevent spoofing the date and to work around mail servers with off clocks....
- 754
1
vote
1
answer
809
views
Why is opendmarc SPF failing this arriving message?
Why is this incoming message failing?
postfix/smtpd[4776]: connect from mail-mw2nam10on2073.outbound.protection.outlook.com[40.107.94.73]
postfix/smtpd[4776]: Anonymous TLS connection established ...
- 145
1
vote
2
answers
3k
views
All mails to Yahoo are deferred or in spam
i have read a lot about the problems of delivering mail to yahoo.com, i have contact the tech support but the result it's always the same: from my server all mails to yahoo./aol. are deffered and when ...
1
vote
1
answer
1k
views
Correct DKIM, Reverse DNS configuration to send from 2 different domains?
I have set up Postfix on an Ubuntu 18.04, with a view to sending emails from two different domains, which I will refer to here as abc.com and xyz.com. I'm trying to configure everything so that emails ...
- 171
1
vote
1
answer
740
views
Postfix send mail only to GMail, all other domains are deferred and not sended
My Postfix server is running on Debian Stretch. It is able to send emails to a GMail address without problems which are not considered as spam. At the DNS level I configured DKIM, SPF and DMARC and ...
- 11
0
votes
1
answer
462
views
How can I fix emails being marked as spam after being edited by Postfix?
Recently, I set up a Linux server running Postfix that I'm using to send and relay emails. I've also set up an email address that's used as an alias and forwards the emails to another email address, ...
- 331
0
votes
0
answers
1k
views
Change From (Sender) address using Postfix as a relay and pass validation
I'm trying to relay mail via Postfix and change the sender address whilst also passing DKIM/DMARC validation.
So if I send an email from [email protected] via the Postfix relay (using it as a smart ...
0
votes
1
answer
95
views
Postfix working on separate server having issues delivering mail to a specific domain
I have the following situation.
My main domain is pointed to a Hostgator account. Because of bad performance of the site, the client decided to give DigitalOcean a go, but leaving the e-mails on ...
- 107
2
votes
0
answers
419
views
E-mail body changed after DKIM signing
I've got a postfix e-mail server which uses amavisd-new for virus scanning, spam checking, DKIM checking and DKIM signing. I'm having issues with the DKIM signing in particular.
Amavisd-new signs the ...
- 21
2
votes
1
answer
517
views
DKIM set on AWS EC2 but mail header says none in Outlook
I'm configuring an AWS EC2 instance with Postfix, and have set it up with Route53 including reverse DNS. I've tested that I can send emails, and Outlook receives them fine, but Gmail does not. I ...
- 331
4
votes
2
answers
4k
views
OpenDKIM query timed out (even with opendkim-testkey and Nameservers set)
I try to set up a mail server on Debian with opendkim and opendmarc
When I receive an email, SpamAssassin refuse it because opendkim can't do the DNS query
I tested with opendkim-testkey command, ...
- 61
-1
votes
1
answer
4k
views
How do I check for a DKIM-signature? (Postfix)
I'm running Postfix on my Debian client and I'm trying to setup DKIM. The problem I'm having is that the mails do not seem to get signed by DKIM.
I'm using telnet to send an email from one local user ...
- 77
3
votes
1
answer
1k
views
Postfix does not pass mails to Amavis, when received from Z-push
Im kind of staring myself blind in how get ActiveSync to work correctly with my mailserver, so maybe anybody here have an idea?
The deal is mailserver is hosting four domains and I want that all sent ...
- 1,055