Gmail & Yahoo bulk sender requirements checker
Gmail, Yahoo and Outlook now reject or spam-folder mail from bulk senders without proper authentication. Enter your sending domain to see which of the DNS requirements you meet and what to fix.
Works with a domain, an email address or a website URL. Lookups run in your browser over public DNS; nothing is stored.
Checking many domains, or clients' domains?
The Email Deliverability Checker audits SPF, DKIM, DMARC, MTA-STS and BIMI for hundreds or thousands of domains at once, grades each A–F with fixes, and exports to CSV/Excel or an API. Run it on a schedule to catch broken records. $8 per 1,000 domains, no subscription.
Run the bulk checker on ApifyFAQ
What are the Gmail and Yahoo sender requirements?
All senders need SPF or DKIM, valid forward and reverse DNS, TLS and a spam rate under 0.3%. Bulk senders (over 5,000 messages a day to Gmail) also need both SPF and DKIM, a DMARC record of at least p=none, a From domain aligned with SPF or DKIM, and one-click unsubscribe.
Does Microsoft Outlook have the same rules?
Yes. Since May 2025 Outlook.com, Hotmail and Live require SPF, DKIM and DMARC from domains sending over 5,000 messages a day.
What happens if I don't comply?
Your mail is increasingly rejected with 5.7.x errors or sent to spam, starting with the least-engaged recipients.
Which parts can't be checked from DNS?
Alignment, one-click unsubscribe and spam rate depend on how your email is sent. Check a sent message's headers and Google Postmaster Tools for those.
Related free tools: Full SPF/DKIM/DMARC audit · SPF checker · DMARC checker · DKIM checker · MX lookup · Gmail/Yahoo sender rules · SPF generator · DMARC generator