# DMARCwise Blog

Email authentication news, technical guides, and industry updates.

- [Guide to email sender requirements in 2026](/blog/email-sender-compliance) (2026-07-22) — Major email providers including Gmail, Apple, and Outlook are enforcing stricter sender requirements. Learn how this affects you.
- [Why DMARC's new "np" tag can fail with DNSSEC](/blog/dmarc-np-incompatibility-with-dnssec) (2026-07-04) — How DNSSEC compact denial can prevent DMARC's new np policy from being applied and which providers and implementations are affected.
- [How to update your DMARC record for RFC 9989](/blog/how-to-update-dmarc-record-rfc9989) (2026-06-10) — Learn how RFC 9989 changes DMARC records and whether you need to update your domain's record.
- [GMX, WEB.DE and mail.com start fully enforcing DMARC for 42 million mailboxes](/blog/gmx-webde-dmarc-enforcement-2026) (2026-05-23) — The email provider 1&1 (GMX, WEB.DE, mail.com) is rolling out full DMARC enforcement, rejecting emails that fail authentication checks.
- [DMARC is now an IETF Proposed Standard: what's new in RFCs 9989–9991](/blog/new-dmarc-2026) (2026-05-20) — The IETF has published the new DMARC specification as a Proposed Standard. Learn how the DMARC record and the algorithms are changing.
- [Gmail ramps up enforcement of the new sender requirements](/blog/gmail-sender-requirements-enforcement) (2025-11-04) — Google says it's intensifying email sender requirements for Gmail: learn more about what it means for you.
- [Should you use -all or ~all in your SPF record?](/blog/spf-all-qualifier-debate) (2025-10-31) — All you need to know about the debate around -all vs ~all in your SPF record.
- [Microsoft's new sending limit for "onmicrosoft.com" subdomains](/blog/onmicrosoft-sending-limits) (2025-09-11) — Starting October 2025, Microsoft 365 customers will face new limits when sending from "onmicrosoft.com" domains.
- [La Poste starts enforcing SPF, DKIM and DMARC on all inbound email](/blog/laposte-new-requirements-2025) (2025-09-09) — Starting 9 September 2025, La Poste requires either SPF or DKIM alignment to pass, or emails will be penalized.
- [How to create a DNS record](/blog/create-dns-record) (2025-08-25) — Here are some tips on how to create a DNS record with your DNS provider.
- [Cloudflare starts enforcing SPF and DKIM on forwarded emails](/blog/cloudflare-new-requirements-2025) (2025-05-03) — Starting 3 July 2025, Cloudflare Email Routing requires either SPF or DKIM to pass, in addition to DMARC enforcement.
- [Microsoft Outlook will require DMARC starting in May 2025](/blog/outlook-new-requirements-2025) (2025-04-03) — Microsoft has announced that SPF, DKIM and DMARC will be required for bulk senders, starting on 5 May 2025. Learn how to comply and secure your email setup.
- [DMARCbis is around the corner: what's changing](/blog/upcoming-dmarc-bis) (2024-11-26) — The updated DMARC specification is almost ready. Learn how the DMARC record and the algorithms are going to change.
- [SPF and DKIM don't stop spoofing: why you need DMARC](/blog/why-you-need-dmarc) (2024-11-21) — Did you know that SPF and DKIM alone aren't enough to prevent spoofing? Learn more about why DMARC is needed.
- [How to add an IP address to the SPF record](/blog/how-to-add-ip-to-spf) (2024-09-29) — A quick guide on updating your SPF record to include a new IPv4 or IPv6 address or range.
- [Is Gmail going to enforce a "reject" DMARC policy?](/blog/gmail-yahoo-future-reject-policy) (2024-09-25) — How likely is it that a DMARC policy of reject will become mandatory? Here's what we know and what are the expectations.
- [How is Gmail's bulk sender threshold calculated?](/blog/gmail-bulk-sender-threshold-calculation) (2024-09-23) — Here are the rules to know if you're a bulk sender: they depend on where you send email and from which domains.
- [The new Gmail and Yahoo requirements for email delivery (2024)](/blog/gmail-yahoo-new-requirements-2024) (2024-09-22) — Gmail and Yahoo's 2024 email rules require SPF, DKIM, and DMARC alignment for senders. Learn how to comply and secure your email setup.