Why do my emails end up in spam? Your quote has gone out, but there’s been no reply. The reason: it has landed in the spam folder. Often your domain is simply missing three entries.

How email programs recognise you

Gmail, Outlook and the like check every email to see whether it really comes from the stated sender. To do this, they look at three entries stored with your domain: SPF, DKIM and DMARC.

The three entries, simply explained

• SPF is the guest list. It states which servers are allowed to send emails on behalf of your domain.
• DKIM is the seal on the letter. Every email gets a digital signature. This lets the recipient see that it was not altered along the way.
• DMARC is the house rule. It sets out what should happen to emails that fail the check, for example that they go straight to spam.

Why this has mattered more since 2024

Since February 2024, Google has required all senders to have at least SPF or DKIM set up. Anyone who sends a lot of emails needs all three entries (Google’s guidelines for senders). In May 2025, Microsoft followed suit for bulk senders on Outlook.com. Emails that do not meet these requirements end up in spam or are rejected.

The second reason: protection against fraudsters

Without these entries, someone can send emails that look as though they come from you, for example fake invoices to your customers. DMARC puts a stop to that.

What you can check yourself

• Send an email to a Gmail address and open it there. Under “Show original” you can see whether SPF, DKIM and DMARC have passed (“PASS”).
• Ask your provider whether the three entries are set up for your domain.
• Use an address with your own domain, for example info@yourcompany.ch, rather than a Gmail or Bluewin address. It looks more professional.

How we do it

For mailboxes on our servers in Switzerland, we set up SPF, DKIM and DMARC from the start, so that your quotes arrive where they belong: in the inbox.