MailGenius Urges Senders to Verify Email Authentication Before the Back to School and Q4 Mailing Surge
St Petersburg, United States – Aug 17,2026- Email deliverability testing company MailGenius is advising marketing and operations teams to audit their SPF, DKIM, and DMARC records now, ahead of the two heaviest sending periods of the year. August reactivates education and retail mailing lists that have been dormant since spring, and Q4 planning begins immediately after, which means many organizations will raise volume sharply against sender records that have not been reviewed in months.
The company’s position is that authentication failures are the most common and most fixable cause of the deliverability drops senders report during high volume seasons. Unlike content or timing problems, they can be identified in minutes and corrected before a single campaign goes out.
Why unauthenticated senders lose the most ground in peak season Mailbox providers weigh authentication before they weigh anything else. When sending volume rises, the tolerance for unresolved authentication problems narrows, and messages that were quietly accepted at low volume begin to be filtered. MailGenius sees three recurring versions of the problem.
SPF records that have outgrown their limits Organizations add sending platforms throughout the year and rarely revisit the record that authorizes them. A domain can end up with a second SPF record published by another team, or with more DNS lookups than the specification permits, and either condition renders the whole record unusable to receivers rather than partially valid.
DKIM signatures that stopped matching Sending platforms rotate signing keys and introduce new selectors. When the DNS side is not updated in step, or when only the primary platform is signing while secondary systems are not, email from those systems arrives unsigned or with a signature that cannot be verified.
DMARC policies still sitting at monitoring A large share of domains publish a DMARC record and never advance it past the monitoring stage, which produces reports nobody reads and no protection against anyone spoofing the domain. Enforcement is also the prerequisite for BIMI, so domains stuck at monitoring cannot display a verified brand logo in supporting inboxes.
Free checks senders can run this month MailGenius offers free authentication checkers for SPF, DKIM, DMARC, and BIMI, along with a free inbox placement test that evaluates a real message rather than a pasted draft. Each tool works the same way. The sender sends one email to the address shown on the page and then retrieves a breakdown covering authentication results, content flags, and blocklist status.
Senders can run the inbox placement test at https://www.mailgenius.com/inbox-placement-test/ and the individual record checkers from the tools menu on the same site.
The company’s recommendation for August is straightforward. Audit the records before volume rises, correct anything the checks surface, and re-test with a live message rather than assuming a DNS change took effect.
About MailGenius
MailGenius is a free email deliverability testing platform that simulates inbox behavior across major providers including Gmail, Outlook, and Yahoo, so senders can catch deliverability issues before they hit send. Every test returns a full breakdown of what is helping or hurting inbox placement, covering authentication, content, and blocklist status. MailGenius also publishes free SPF, DKIM, DMARC, and BIMI record checkers and offers hands on deliverability consulting led by founder Troy Ericson.
Media Contact MailGenius Email: [email protected] Website: https://www.mailgenius.com/
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Company Name: Ericson
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City: St Petersburg
Country: United States
Website: https://www.mailgenius.com/
