If you have noticed that your emails are going to spam for various receivers, this can indicate many reasons why this has happened:

  • Your content is being detected as spam-like

  • You are not using a reliable method to send emails

No worries, we will guide you through the process of preventing your emails from ending up in the spam inbox.

Option 1 – Marking as “Not spam”

The first solution will solve the issue for the exact recipients. You can ask the recipients themselves to mark the emails you’ve sent as Not spam, once they do that, emails from you won’t end up in the Spam inbox ever again.

Option 2 – Adding DNS verification

All modern mail services have an additional verification of the sender to check that a letter is really sent from this address, this domain. Such a check takes time, and the message may be marked as spam if it does not pass the verification.

To help the domain pass such checks, you just need to add two types of DNS records: SPF and DKIM.

You can get these records from your email service provider. For example, if you use Zyro's Titan email, you will set up SPF and DKIM records by following this tutorial.

Option 3 – Check the email’s subject

One of the most common things that prevent emails from being delivered is their subject. It is better to avoid using these things in your subject line:

  • Misspelled words

  • The words “Test”, “Check” or similar

  • Phrases like “Open this letter”, “Read me”, “URGENT” or similar

  • A random set of letters or numbers

Additional recommendations for the content of the subject line:

  • It is better not to write the topic in ALL CAPITAL LETTERS.

  • The subject line of the letter should correspond to its text.

  • Do not try to fit the entire text of the letter into the subject – it should be short (but not 1 word like “Hello”). Also, don't leave the subject blank.

  • Don't use special characters (like % ^ >).

  • Do not add “Re:” to reply to a message.


  • Examples of bad subject lines: “READ”, “siknvdjhvbls”, “Re:”

  • Examples of good subject lines: “Information about your order for ceiling tiles”, “Orchid exhibit this Friday”

These tips will help you to create a subject line that will be more positively accepted not only by mail services but also by your recipients 😊

Option 4 – Improve deliverability with a Mail tester

And finally, the content of your email. To check how good your email is, please visit MailTester. All you will need to do is:

  1. Send a message (exactly the same that you would like to send to a client or another recipient) to the temporary address indicated on the screen

  2. Follow the recommendations

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