Onnowpurbo: /* Web-based Record Check */

2019-10-04T02:44:16Z

Web-based Record Check

← Older revision		Revision as of 02:44, 4 October 2019
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	==Web-based Record Check==		==Web-based Record Check==

	~~You can use http://www.protodave.com/tools/dkim-key-checker/~~		Bisa menggunakan

	~~Use~~ selector mail ~~and~~ domain example.com ~~there.~~		http://www.protodave.com/tools/dkim-key-checker/

			Gunakan

			* selector mail
			* domain example.com

	==Verify DKIM Signing==		==Verify DKIM Signing==

Onnowpurbo: /* DNS Record Setup */

2019-10-04T02:41:00Z

DNS Record Setup

← Older revision		Revision as of 02:41, 4 October 2019
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	Gunakan mail._domainkey untuk NAME dan long string yang dimulai dari v=DKIM1 as VALUE.		Gunakan mail._domainkey untuk NAME dan long string yang dimulai dari v=DKIM1 as VALUE.

	~~Below is a sample screenshot for a TXT record. User-interface on your end might differ.~~

	==Start Signing==		==Start Signing==

Onnowpurbo at 02:27, 4 October 2019

2019-10-04T02:27:29Z

Show changes

Onnowpurbo at 02:05, 4 October 2019

2019-10-04T02:05:50Z

← Older revision		Revision as of 02:05, 4 October 2019
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	Its highly recommended to use DKIM for outgoing emails even if your server is not running any kind of mail-hosting.		Its highly recommended to use DKIM for outgoing emails even if your server is not running any kind of mail-hosting.

	Install DKIM		==Install DKIM==

	apt-get install opendkim opendkim-tools		apt-get install opendkim opendkim-tools

	~~Edit Config files~~
	DKIM config		==DKIM config==

	Open dkim config file vim /etc/opendkim.conf		Open dkim config file vim /etc/opendkim.conf

Onnowpurbo: /* Pranala Menarik */

2019-10-03T23:08:55Z

Pranala Menarik

← Older revision		Revision as of 23:08, 3 October 2019
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	==Pranala Menarik==		==Pranala Menarik==

			* [[Postfix]]

Onnowpurbo: Created page with "Sumber: https://easyengine.io/tutorials/mail/dkim-postfix-ubuntu/ DKIM with Postfix If mails from your web-server/webapp is having delivery issues, DKIM (DomainKeys Identif..."

2019-10-03T23:08:14Z

Created page with "Sumber: https://easyengine.io/tutorials/mail/dkim-postfix-ubuntu/ DKIM with Postfix If mails from your web-server/webapp is having delivery issues, DKIM (DomainKeys Identif..."

New page

Sumber: https://easyengine.io/tutorials/mail/dkim-postfix-ubuntu/

DKIM with Postfix

If mails from your web-server/webapp is having delivery issues, DKIM (DomainKeys Identified Mail) can help you big time.

Its highly recommended to use DKIM for outgoing emails even if your server is not running any kind of mail-hosting.

Install DKIM

apt-get install opendkim opendkim-tools

Edit Config files
DKIM config

Open dkim config file vim /etc/opendkim.conf

Add following lines towards end. Make sure you replace example.com with your domain/subdomain.

Domain example.com
KeyFile /etc/postfix/dkim.key
Selector mail
SOCKET inet:8891@localhost

Next open dkim defaults file vim /etc/default/opendkim

Change default socket path by adding a line like below:

SOCKET="inet:8891@localhost"

Postfix file

Open postfix main config file vim /etc/postfix/main.cf

Add following lines towards end.

# DKIM
milter_default_action = accept
milter_protocol = 2
smtpd_milters = inet:localhost:8891
non_smtpd_milters = inet:localhost:8891

DKIM Key Generation

Run following commands with mail and example.com matching values used in /etc/opendkim.conf file in earlier step.

opendkim-genkey -t -s mail -d example.com

This command will generate mail.private and mail.txt file. mail.private is private key that will be used to sign outgoing emails. Move it to the location we specified earlier in /etc/opendkim.conf

cp mail.private /etc/postfix/dkim.key

DNS Record Setup

Next, you need to create a TXT record on DNS end. Just check content of mail.txt file created by opendkim-genkey command we ran above.

cat mail.txt

You will see something like below:

mail._domainkey IN TXT "v=DKIM1; k=rsa; t=y; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDYv84GSl0Xp2CrPdFqMZ9ShBDi9Pal9XpfIf7asEENxLRdIka3TONpqtrcCKksROJBNh2G3OVGuoGJ1watQGT46B+zQtjcCI67+WiTlb2D98s1UV3KO7oi/0QH/lH8DzUmrGJUIy3ZBQ9mIu1t6YDyi8y3hlhTILHW7G4HV/VtwQIDAQAB" ; ----- DKIM key mail for example.com

TXT record will require NAMS & VALUE.

Use mail._domainkey for NAME and long string in quotes starting from v=DKIM1 as VALUE.

Below is a sample screenshot for a TXT record. User-interface on your end might differ.

TXT-DKIM record-1

If you are editing a previous DNS record, it might take sometime for changes to propogate.
Start Signing

Once al config & setup done, you need to start DKIM service and restart postfix.

service opendkim start
service postfix restart

Testing DKIM setup for correctness

Anything we do, specially for first time, must end with successful testing!

There are many tools for testing. I will mention few of them below.
Verify DNS Records for DKIM Setup

This will ONLY verify if your TXT record is created successfully.
dig command

Classic and easy. You must be having this already. Running…

dig mail._domainkey.example.com TXT

should return a response like…

;; ANSWER SECTION:
mail._domainkey.exmaple.com. 86400 IN TXT "v=DKIM1\;" "k=rsa\;" "t=y\;" "p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDYv84GSl0Xp2CrPdFqMZ9ShBDi9Pal9XpfIf7asEENxLRdIka3TONpqtrcCKksROJBNh2G3OVGuoGJ1watQGT46B+zQtjcCI67+WiTlb2D98s1UV3KO7oi/0QH/lH8DzUmrGJUIy3ZBQ9mIu1t6YDyi8y3hlhTILHW7G4HV/VtwQIDAQAB"

Web-based Record Check

You can use http://www.protodave.com/tools/dkim-key-checker/

Use selector mail and domain example.com there.
Verify DKIM Signing
Test #1 – Email-based

If you have setup keys correctly then you should pass this test.

You can test by simply sending an email to autorespond+dkim@dk.elandsys.com or check-auth2@verifier.port25.com

It’s better to use swaks tools for mail-testing (apt-get install swaks).

swaks -t check-auth2@verifier.port25.com -f me@example.com

Replace me@example.com with your mail id where you would like to receive test results.
Test #2 – Web-based

Better choice will be to use a service like http://www.mail-tester.com/ which gives you a temporary email ID and web-interface to see what happens to the email on receiving end!

==Referensi==

* https://easyengine.io/tutorials/mail/dkim-postfix-ubuntu/

==Pranala Menarik==

Postfix: DKIM - Revision history

Onnowpurbo: /* Web-based Record Check */

Onnowpurbo: /* DNS Record Setup */

Onnowpurbo at 02:27, 4 October 2019

Onnowpurbo at 02:05, 4 October 2019

Onnowpurbo: /* Pranala Menarik */

Onnowpurbo: Created page with "Sumber: https://easyengine.io/tutorials/mail/dkim-postfix-ubuntu/ DKIM with Postfix If mails from your web-server/webapp is having delivery issues, DKIM (DomainKeys Identif..."