If your legitimate business emails are landing in spam, the cause is almost never your content. It's authentication. 53.21% of domains publish SPF, but SPF alone isn't enough — without DMARC enforcement, mail servers treat even authenticated email with residual suspicion.
Why mail servers junk your email
Modern mail servers make delivery decisions based on signals. The strongest signals are authentication signals: SPF (is this server authorised to send for this domain?), DKIM (does this email have a valid cryptographic signature from the domain?), and DMARC (what should happen if either check fails?).
Without these signals, a mail server has only reputation and content analysis to work with. For new sending domains, transactional mail, or anything going to Gmail or Yahoo, that's not enough.
What changed
In February 2024, Google and Yahoo enforced new sender requirements. Domains sending to Gmail or Yahoo addresses now need valid SPF, DKIM, and DMARC — and bulk senders (2,000+ emails/day) need DMARC at enforcement level. Domains that had been getting through on reputation alone started failing.
If your emails recently started going to spam, this is the most likely cause.
How to diagnose the problem
Run the free DomainScores check on your domain. It shows your current SPF, DKIM, and DMARC grades immediately — no setup, no signup. The result tells you exactly which authentication signal is missing or misconfigured.
The fix order matters: SPF first, then DKIM, then DMARC. You can't achieve DMARC enforcement without the other two working correctly.
Want this fixed properly? Domain Fix from €1,197 — we configure SPF, DKIM, and DMARC correctly, test deliverability, and guarantee a B+ domain grade or your money back.