1 files changed, 11 insertions, 0 deletions

diff --git a/support/doc/docker.md b/support/doc/docker.md
index 2ee922b87..99aa688a9 100644
--- a/support/doc/docker.md
+++ b/support/doc/docker.md
@@ -114,6 +114,17 @@ peertube_1  | [example.com:443] 2019-11-16 04:26:06.082 info: Username: root
 peertube_1  | [example.com:443] 2019-11-16 04:26:06.083 info: User password: abcdefghijklmnop
 ```
 
+### Obtaining Your Automatically Generated DKIM DNS TXT Record
+[DKIM](https://en.wikipedia.org/wiki/DomainKeys_Identified_Mail) signature sending and RSA keys generation are enabled by the default Postfix image `mwader/postfix-relay` with [OpenDKIM](http://www.opendkim.org/).
+Run `cat ./docker-volume/opendkim/keys/*/*.txt` to display your DKIM DNS TXT Record containing the public key to configure to your domain : 
+```BASH
+user@s:~/peertube|master⚡ ⇒  cat ./docker-volume/opendkim/keys/*/*.txt
+
+peertube._domainkey.mydomain.tld.       IN      TXT     ( "v=DKIM1; h=sha256; k=rsa; "
+          "p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA0Dx7wLGPFVaxVQ4TGym/eF89aQ8oMxS9v5BCc26Hij91t2Ci8Fl12DHNVqZoIPGm+9tTIoDVDFEFrlPhMOZl8i4jU9pcFjjaIISaV2+qTa8uV1j3MyByogG8pu4o5Ill7zaySYFsYB++cHJ9pjbFSC42dddCYMfuVgrBsLNrvEi3dLDMjJF5l92Uu8YeswFe26PuHX3Avr261n"
+          "j5joTnYwat4387VEUyGUnZ0aZxCERi+ndXv2/wMJ0tizq+a9+EgqIb+7lkUc2XciQPNuTujM25GhrQBEKznvHyPA6fHsFheymOuB763QpkmnQQLCxyLygAY9mE/5RY+5Q6J9oDOQIDAQAB" )  ; ----- DKIM key peertube for mydomain.tld
+```
+
 ### What now?
 
 See the production guide ["What now" section](/support/doc/production.md#what-now).