Find out why your business emails land in spam, get blocked by Gmail & Outlook, or fail authentication. Instant DNS diagnostic with step-by-step fixes.
Modern email gateways (Google Workspace, Microsoft 365 Defender, Proofpoint, Barracuda) reject or spam-box messages that fail cryptographic authentication. Here are the 5 most common reasons your emails don't reach client inboxes:
RFC 7208 mandates that an SPF record cannot trigger more than 10 DNS lookups. Adding multiple vendors (Google, Microsoft, HubSpot, Mailchimp, QuickBooks) easily breaks this limit, triggering a silent PermError that invalidates your entire SPF protection.
DomainKeys Identified Mail (DKIM) adds an asymmetric digital signature to every sent email. Without DKIM, receiving mail servers cannot verify that the email was actually created by your organization or that it was not altered in transit.
A DMARC policy set to p=none acts like a surveillance camera that watches a break-in without locking the door. Spammers can spoof your domain freely, and your legitimate emails fail alignment checks at major receivers.
Sending business proposals or invoices from @gmail.com or @yahoo.com shares IP reputation with billions of consumer accounts. Corporate spam filters assign higher baseline risk to freemail senders attempting B2B outreach.
When platforms like QuickBooks, Stripe, or your CRM send invoices on your behalf using your domain name without proper custom DKIM and SPF CNAME delegation, receiving filters classify them as spoofed impersonations.
Receiving email servers verify that the IP address transmitting the message resolves back to the hostname declared in the SMTP handshake. Mismatched or missing PTR records cause immediate spam folder routing.
Google and Yahoo enforce strict email delivery rules for all senders targeting personal and workspace inboxes. Senders failing to meet the following baseline requirements experience immediate delivery throttles, 550 error bounce backs, and automatic junk placement:
_dmarc.yourdomain.com.Common questions about email spam, DNS records, and inbox placement.
Emails typically land in spam because of failed authentication (missing or broken SPF, DKIM, or DMARC records), exceeding the global 10-DNS-lookup limit (SPF PermError), sending from free-mail domains like @gmail.com for business, or using shared server IPs with poor sender reputation.
RFC 7208 limits SPF validation to a maximum of 10 DNS lookups. If your SPF record includes too many third-party services (e.g., Microsoft 365, Mailchimp, HubSpot, Zendesk), receiving servers encounter a PermError and treat your email as having zero protection, frequently discarding or spam-boxing messages.
No. While Microsoft 365 and Google Workspace provide enterprise mail servers, you must explicitly publish custom SPF, DKIM (CNAME/TXT), and DMARC DNS records in your domain registrar. Without these custom records, your emails will fail authentication.
DNS changes typically propagate within 15 minutes to 2 hours. Once receiving gateways (Gmail, Microsoft Defender, Proofpoint) detect valid SPF, DKIM, and DMARC records, inbox placement begins improving immediately for subsequent outbound emails.
Simple records (like adding a single SPF include) can be done in your DNS control panel. However, flattening complex SPF records exceeding 10 lookups, setting up DKIM selector keys, and safely transitioning DMARC to p=reject without blocking legitimate billing tools requires deliverability engineering experience.
We configure verified Microsoft 365 and Google Workspace environments with flawless SPF, DKIM, and DMARC enforcement so your invoices and proposals land in primary inboxes.
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