Why Zoho CRM Emails Go to Spam — And Exactly How to Fix Each Cause

Zoho CRM emails landing in spam is one of the most frustrating and common problems in CRM operations. The emails look correct in Zoho CRM, they show as sent, but they are not reaching the inbox. This guide takes a systematic approach: diagnose which specific cause is affecting your sending, then apply the exact fix for each. Most deliverability problems come from one of six causes, and most are fixable without specialist help once you know what to look for. For the ABR extension that monitors all of these factors on an ongoing basis, see the ABR Email Deliverability Extension. For the email hub overview, see the Zoho CRM email extensions hub.

Cause 1: SPF Record Not Configured for Zoho CRM

SPF (Sender Policy Framework) is a DNS TXT record that lists the mail servers authorised to send email from your domain. When Zoho CRM sends an email, the receiving server checks your SPF record. If Zoho’s mail servers are not listed, the message fails SPF authentication.

How to diagnose: Go to MXToolbox.com → SuperTool → enter your domain → select SPF Record Lookup. If you see no Zoho entry, your SPF is incomplete.

How to fix: Add Zoho’s SPF include to your domain’s DNS TXT record:

“v=spf1 include:_spf.google.com include:zoho.com ~all”

DNS changes typically propagate within 1–24 hours. Re-test with MXToolbox after propagation.

Cause 2: DKIM Not Enabled for Your Sending Domain

DKIM (DomainKeys Identified Mail) adds a cryptographic signature to outgoing emails that receiving servers can verify. Most major spam filters now give significantly higher trust to DKIM-signed messages.

How to diagnose: In Zoho CRM: Settings → Email → Email Configuration → look for a DKIM status indicator. If it shows Not configured, DKIM signing is not active.

How to fix: In Zoho CRM Settings → Email → Email Configuration → configure DKIM for your domain. Zoho will provide a DKIM DNS record (TXT record containing the public key) to add to your domain’s DNS. After adding and allowing propagation, Zoho CRM will sign all outgoing emails.

Cause 3: No DMARC Record

DMARC tells receiving servers what to do when SPF or DKIM authentication fails. Since 2024, Google and Yahoo require DMARC records for bulk senders — a missing DMARC record results in emails being rejected or spam-foldered.

How to fix: Add a DMARC TXT record to your domain’s DNS:

“v=DMARC1; p=none; rua=mailto:dmarc-reports@yourdomain.com”

Replace yourdomain.com with your actual domain. Once SPF and DKIM are confirmed working, upgrade the policy from p=none to p=quarantine and eventually p=reject.

Cause 4: High Bounce Rate

Every time Zoho CRM sends to an email address that no longer exists (hard bounce), it signals to spam filters that your list is poorly maintained. Deliverability begins declining once bounce rates exceed approximately 2%.

How to diagnose: In Zoho CRM, run a report on Email activities filtered by Status = Hard Bounced. Calculate as a percentage of total sent volume.

How to fix: Suppress all hard-bounced addresses immediately. Create a CRM view of contacts where email status = bounced and remove them from all active automations. The ABR Email Deliverability Extension handles bounce suppression automatically.

Cause 5: Volume Spikes

Spam filters learn what is normal for a sending domain. A domain sending 30 emails per day suddenly sending 3,000 looks anomalous. Volume spikes typically occur when a business imports a large contact list and immediately sends a campaign.

How to fix: Warm up gradually. Increase the daily send count by no more than 20–30% per day. Use Zoho CRM’s scheduled sends to control daily volume during the warm-up period.

Cause 6: Content Triggering Spam Filters

Even with perfect authentication and a clean list, certain content patterns trigger spam filters:

Subject lines with ALL CAPS, excessive exclamation marks or classic spam trigger words (FREE, GUARANTEED, ACT NOW)
Emails with very high image-to-text ratios
Emails with multiple external links pointing to different domains
Links to domains with poor reputations

Fix: Use Mail Tester (mail-tester.com) before sending a campaign. Send a test email to their address and review the full scoring report to identify content-level issues.

Frequently Asked Questions

How do I know if my Zoho CRM emails are landing in spam?

The most reliable method is to send test emails to addresses at Gmail, Outlook and Yahoo and check whether they arrive in the inbox or spam. You can also use mail-tester.com which gives a deliverability score and identifies specific issues. For ongoing monitoring, Google Postmaster Tools shows your domain’s reputation score with Gmail specifically.

Will fixing SPF and DKIM immediately stop emails going to spam?

Technical fixes like SPF, DKIM and DMARC corrections take effect within 24–48 hours of DNS changes propagating. However, if your domain’s sender reputation has already been damaged by previous deliverability issues, it takes 30–90 days of clean sending to rebuild the reputation even after the technical fixes are in place.

Does Zoho CRM help me set up DKIM?

Yes. Zoho CRM has a built-in DKIM configuration guide in Settings → Email → Email Configuration. Zoho generates the DKIM DNS record values for you — you just need to add them to your domain’s DNS settings. Most domain registrars (GoDaddy, Namecheap, Cloudflare) make this straightforward once you have the values from Zoho.

How often should I clean my Zoho CRM email list?

Hard-bounced addresses should be suppressed immediately after each send — never send to them again. For inactive contacts (valid email but no opens or clicks in 12+ months), consider a re-engagement campaign before removing them. Running a quarterly audit of your contact database keeps bounce rates below the 2% threshold that damages sender reputation.

Fix Your Zoho CRM Email Deliverability

ABR diagnoses and fixes Zoho CRM email deliverability issues for SMBs. Book a free assessment — we check your SPF, DKIM, DMARC and bounce rate in the first call.