I am having problems with my VPS trying to set up Postfix as send-only SMTP server using this tutorial:
Everything has been done the same way as they say in the tutorial and I’ve followed both of these tutorials as well:
My Zone file has the following information:
$ORIGIN my.example.com. $TTL 1800 my.example.com. IN SOA ns1.digitalocean.com. hostmaster.my.example.com. 1516099513 10800 3600 604800 1800 my.example.com. 1800 IN NS ns1.digitalocean.com. my.example.com. 1800 IN NS ns2.digitalocean.com. my.example.com. 1800 IN NS ns3.digitalocean.com. my.example.com. 3600 IN A 123.456.789.01 my.example.com. 3600 IN AAAA 2b02:c1d0:2:d0::132:3001 my.example.com. 3600 IN TXT "v=spf1 mx a ip4:123.456.789.01 ~all" mail._domainkey.my.example.com. 3600 IN TXT "v=DKIM1; k=rsa; p=MIGfMA0GCFqGSIb3DQEBAQUAA4GNADCBiQKBgQCZW8z/5Pvx6xhd2zEPAZNul02xDkb6xEOK1bgmDDypeZ18oOIOZk39WHU4tBoHyJm08e0ddfNtsmWSPyedjnIraOL+cG4lZgr0mAJmK/A1K2i+enoVQFiLitxieEeavtahTrJau5rr5BGqZFwAfwtdbSJOk4DrgexamwBnuaZL0wIGAQAB"
I’ve replaced the real domain and IPs with fake ones due to we’re using a confidential domain at this point. I’m hoping this can be resolved without exposing it.
My mail.txt file inside
/etc/opendkim/keys/my.example.com looks like this (which was generated during the tutorial for DKIM):
mail._domainkey IN TXT ( "v=DKIM1; k=rsa; " "p=MIGfMA0GCFqGSIb3DQEBAQUAA4GNADCBiQKBgQCZW8z/5Pvx6xhd2zEPAZNul02xDkb6xEOK1bgmDDypeZ18oOIOZk39WHU4tBoHyJm08e0ddfNtsmWSPyedjnIraOL+cG4lZgr0mAJmK/A1K2i+enoVQFiLitxieEeavtahTrJau5rr5BGqZFwAfwtdbSJOk4DrgexamwBnuaZL0wIGAQAB" ) ; ----- DKIM key mail for my.example.com
Using different DKIM checkers, I get information such as:
DNS query failed for 'mail._domainkey.my.example.com':NXDOMAIN A public-key (p=) is required
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=my.example.com; s=mail; t=1516097701; bh=WBgqksrfs7F0OzQkyE7LiZPHyfFFhl7N4CNav2f5YVw=; h=Date:To:Subject:From:From; b=nlLoX/6Me+yXljyGp2YDsojBYLEq7dgCt1PHcsvD2A5fh76pbWoJsM9kkm6ytn16z M/re5tI5UQzHOVu7oM7cB11zPHkhFl1efvV5mr+FfedglmFHtew/FsvFwjf/P/3Kld /h/rs26aPmOsFduTtlwUja532pmiyXInGiUsFzzM= Signed-by: firstname.lastname@example.org Expected-Body-Hash: WBhgpZjQs7F2OzQkyE7LiZPHyflshl7N4CNav2f5VVw= DKIM-Result: permerror (no key)
Please note (as title says) that I have had these DNS settings up and running for a week now and the error persists.
What am I missing? I’ve read all the comments and no one seems to be getting the same error as me. If they did have a similar issue, it was resolved from typos.
Thank you in advance!
This textbox defaults to using Markdown to format your answer.
You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!
These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.
Join our DigitalOcean community of over a million developers for free! Get help and share knowledge in Q&A, subscribe to topics of interest, and get courses and tools that will help you grow as a developer and scale your project or business.
Click below to sign up and get $200 of credit to try our products over 60 days!