By Nicolas Avila · October 9, 2026

Your email is going to spam without you knowing

Photo: Avila Ops Tecnologia

If customers say “I didn’t receive it” more than once monthly, or reply days later with “it was in spam,” some emails are being filtered. You receive no notification. Recipients’ providers decide silently, and messages disappear into folders almost nobody opens. You can find out in 10 minutes without paid tools.

This matters most when email carries important information: holiday hours, such as Carnival, following up a stalled quote, collecting a boleto payment. Each spam-filtered email becomes a conversation that never happens.

How do I test whether my email goes to spam?

1. Create or use three accounts you control: Gmail, Outlook (or Hotmail), and Yahoo. They cover the most common filters.
2. Send a real message from your business email: a quote, confirmation, or your usual text. Do not use “test” as the subject.
3. Check where each arrives. Inbox in all three means the issue is isolated and recipient-related. Spam in one or more means the issue is on your side.
4. In Gmail, open the message, click the three dots, then “Show original.” Record SPF, DKIM, and DMARC results: PASS, FAIL, or “none.”

Repeat using your promotional sending tool if you have one. Everyday email commonly passes while campaigns fail because the tool is unauthorized on the domain.

What should you fix, and in what order?

Order matters because each repair depends on the previous one.

Each record’s role and why filters check them before text is covered in What are SPF, DKIM, and DMARC, without technical jargon?. General filtering reasons are in What is a spam folder, and why does your message land there?.

What if customers already said they did not receive it?

Do not simply ask them to “check spam” and stop there.

First, resend urgent information through WhatsApp. Customers need not wait for DNS repairs. Second, ask them to move the message to the inbox and add your address to contacts. This teaches their provider you are legitimate. Third, record the case: date, customer provider, message type. Three cases from one provider in a month reveal where the problem lies.

If the filtered email had a payment link or boleto, tell customers on WhatsApp it is yours before they suspect fraud. That suspicion protects them but hurts your sale.

What to do now

Run the three-account test today. If any record shows FAIL, or your work email is still free, the fix is the same: email on your domain with SPF, DKIM, and DMARC ready, migration included, for R$ 10 per inbox/month, ready today: avilaops.com/email-profissional or contact us on WhatsApp: wa.me/5517997811471.

Frequently asked questions

Are there free tools to test whether email goes to spam?

Some websites score emails sent to temporary addresses. They help interpret headers, but real Gmail, Outlook, and Yahoo accounts remain closest to what customers see.

Why does my email go to spam only in Outlook?

Outlook has its own filter and is usually stricter with domains lacking DMARC and shared servers. If only Outlook filters it, check DMARC first, then sending history to @hotmail and @outlook addresses.

How long after fixing it does email stop going to spam?

SPF, DKIM, and DMARC usually take effect within hours. Reputation takes longer: one to four weeks of regular, well-received messages for providers to update scores.