Hey everyone! I recently set up an Ubuntu VPS for my business and started testing out sending emails using Postfix. I sent some test emails to different Outlook accounts, but they all ended up in the junk folder. Upon checking the email headers, I noticed everything passed except for DKIM. I've already registered my domain through Hostinger and set up the necessary DNS settings, including DMARC, SPF, and DKIM. DKIM validators show that everything is fine with my domain. So, I'm baffled as to why all DKIM checks fail when sending to Outlook. Can anyone help me figure this out?
5 Answers
To really dig into this, it would help to know your domain name. That way, we can check your SPF and DKIM records for any mistakes. Also, check if the IP of your VPS is on any spam lists because that could lead to major email providers blocking your emails automatically.
A good starting point is to clarify what program you're using to apply DKIM to your messages. Postfix alone doesn’t sign emails; it usually works with another tool for that. Providing more details about your setup can also help pinpoint the issue. Mail logs can be very informative for diagnosing these kinds of problems, too!
I’ve found Learndmarc.com to be super handy for visualizing the DMARC and DKIM setup process. It might be worth a look!
Have you actually set up Postfix to sign your emails properly? If you haven't done that step, your DKIM will likely fail regardless of the DNS settings.
It's important to understand that having DKIM records in your DNS is only part of the process. Those records contain your public keys, but you also need to ensure that Postfix is configured to sign your emails using the private keys. Just keep in mind: SPF specifies which IP addresses can send emails for your domain, while DKIM attaches a signature to the email allowing validation. DMARC tells recipients how to handle emails that fail these checks. Make sure you're set up correctly on all fronts to improve your delivery rates!
Learndmarc.com. Follow the online instructions.
Thank you that’s so helpful!
Yes, I did.