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87 lines
3.0 KiB
Markdown
87 lines
3.0 KiB
Markdown
To enable DKIM signature, you must have created your mail accounts.
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Once its done, just run from inside the directory of docker-compose.yml:
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docker run --rm \
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-v "$(pwd)/config":/tmp/docker-mailserver \
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-ti tvial/docker-mailserver:latest generate-dkim-config
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The default keysize is 2048 for now. If you need to change it (e.g. your DNS-Provider limits the size) provide the size as the first parameter of the command
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docker run --rm \
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-v "$(pwd)/config":/tmp/docker-mailserver \
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-ti tvial/docker-mailserver:latest generate-dkim-config 2048
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Now the keys are generated, you can configure your DNS server by just pasting the content of `config/opendkim/keys/domain.tld/mail.txt` in your `domain.tld.hosts` zone.
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After generating DKIM keys you should restart the app.
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```
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; OpenDKIM
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mail._domainkey IN TXT ( "v=DKIM1; k=rsa; "
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"p=AZERTYUIOPQSDFGHJKLMWXCVBN/AZERTYUIOPQSDFGHJKLMWXCVBN/AZERTYUIOPQSDFGHJKLMWXCVBN/AZERTYUIOPQSDFGHJKLMWXCVBN/AZERTYUIOPQSDFGHJKLMWXCVBN/AZERTYUIOPQSDFGHJKLMWXCVBN/AZERTYUIOPQSDFGHJKLMWXCVBN/AZERTYUIOPQSDFGHJKLMWXCVBN" ) ; ----- DKIM key mail for domain.tld
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```
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## Configuration using a web interface:
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1. Generate a new record of the type `TXT`.
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2. Paste `mail._domainkey` the `Name` txt field.
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3. In the `Target` or `Value` field fill in `v=DKIM1; k=rsa; p=AZERTYUGHJKLMWX...`.
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4. In `TTL` (time to live): Time span in seconds. How long the DNS server should cache the `TXT` record.
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5. Save.
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## Verify-only
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If you want DKIM to only verify incoming emails, the following version of /etc/opendkim.conf may be useful (right now there is no easy mechanism for installing it other than forking the repo):
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```
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# This is a simple config file verifying messages only
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#LogWhy yes
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Syslog yes
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SyslogSuccess yes
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Socket inet:12301@localhost
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PidFile /var/run/opendkim/opendkim.pid
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ReportAddress postmaster@my-domain.com
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SendReports yes
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Mode v
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```
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## Debugging
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### Tools
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* [DKIM-verifer](https://addons.mozilla.org/en-US/thunderbird/addon/dkim-verifier): A add-on for the mail client Thunderbird.
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### DKIM TXT Record
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You can debug your TXT records with the `dig` tool.
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```
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dig TXT mail._domainkey.domain.tld
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```
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Output:
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```
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; <<>> DiG 9.10.3-P4-Debian <<>> TXT mail._domainkey.domain.tld
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;; global options: +cmd
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;; Got answer:
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;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 39669
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;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
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;; OPT PSEUDOSECTION:
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; EDNS: version: 0, flags:; udp: 512
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;; QUESTION SECTION:
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;mail._domainkey.domain.tld. IN TXT
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;; ANSWER SECTION:
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mail._domainkey.domain.tld. 3600 IN TXT "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCxBSjG6RnWAdU3oOlqsdf2WC0FOUmU8uHVrzxPLW2R3yRBPGLrGO1++yy3tv6kMieWZwEBHVOdefM6uQOQsZ4brahu9lhG8sFLPX4MaKYN/NR6RK4gdjrZu+MYSdfk3THgSbNwIDAQAB"
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;; Query time: 50 msec
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;; SERVER: 127.0.1.1#53(127.0.1.1)
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;; WHEN: Wed Sep 07 18:22:57 CEST 2016
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;; MSG SIZE rcvd: 310
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``` |