Your reverse DNS does not match with your sending domain

Discussion in 'General' started by onastvar, Jan 24, 2021.

  1. onastvar

    onastvar Member


    Some of my email notifications (sent from [email protected]) from self-hosted Invoice Ninja billing system go to my client's SPAM folder. I ran a SPAM test on

    Reverse DNS lookup or reverse DNS resolution (rDNS) is the determination of a domain name that is associated with a given IP address.
    Some companies such as AOL will reject any message sent from a server without rDNS, so you must ensure that you have one.
    You cannot associate more than one domain name with a single IP address.

    Your IP address is associated with the domain
    Nevertheless your message appears to be sent from

    You may want to change the host name of your server to

    Here are the tested values for this check:
    • IP:
    • HELO:
    • rDNS:
    Anyone know if rDNS is an issue with emails ending up in SPAM/JUNK folder.

    Thanks in advance!
  2. Steini86

    Steini86 Active Member

    Yes, it is. rDNS is mainly used for mail. Just change it to
    onastvar likes this.
  3. onastvar

    onastvar Member

  4. user848429

    user848429 New Member

    indeed, HELO and rDNS must match. (HELO=rDNS)
    If you can't edit the rDNS of your IP address, unfortunately your spam rate will stay high for some providers and common antispams.
  5. onastvar

    onastvar Member

    Thanks @user848429
    I was able to update rDNS for my IP from to
    Hoping emails won't go to SPAM/JUNK folder anymore.
  6. user848429

    user848429 New Member

    And don't forget also to configure the trio DKIM, SPF and DMARC to have a good deliverability rate.
  7. user848429

    user848429 New Member

    You can check the correct configuration of the sending of your mails with this tool, it's very useful to detect problems:
    (limited to 5 mails per 24H)

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