Over the past couple of weeks, we've seen several legitimate messages rejected because DMARC verification failed. In roughly 20 years of handling email, I've only encountered this once…
I received an oddly formatted email claiming that I need to re-attest my network access for Microsoft's Smart Network Data Services (SNDS). The message passed SPF and DKIM,…
Over the past couple of weeks, we've had about five legitimate messages from different companies rejected because they failed DMARC verification. In roughly 20 years of handling email,…
I'm building a website with a user table for managing subscription plans. Authentication and confirmation emails are handled through Supabase, but after redirecting the setup, the messages appear…
I'm building a website with a user table for managing subscription plans. Authentication and confirmation emails are handled through Supabase, but after redirecting the email flow, the messages…
Exchange Online suddenly stopped receiving messages from some services, including PaperCut. The sender receives this error: "550 5.7.509 Access denied — sending domain papercut.com does not pass DMARC…
Our organization uses Exchange Online, and starting last night we stopped receiving scan notifications and other messages sent through PaperCut. The sender receives this error: "550 5.7.509 Access…
My main domain is more than 25 years old and has never been used for spam. Until recently, email forwarding through WHM/cPanel to Gmail worked normally. Seven days…
My primary domain is more than 25 years old and has never been used for spam. Until recently, email was forwarded through WHM/cPanel to my Gmail account without…
We migrated an email domain from one Microsoft 365 tenant to another, but an application still uses a mailbox in the old tenant to send mail through Exchange…
Has anyone else seen a sudden increase in messages between users within the same Microsoft 365 tenant being quarantined as "high confidence phish"? These are internal messages sent…
Our company website uses Gravity Forms to collect submissions and send notification emails to our company inbox. The messages are being quarantined as phishing because DMARC is failing.…
For several weeks, Gmail has been rejecting mail from one of our domains and Postfix servers with a 550-5.7.1 message saying the sending domain has very low reputation.…
We've noticed some phishing emails that appear to originate from Truist. What's concerning is that these emails have valid SPF, DKIM, and DMARC checks. The headers show they're…
We received what seem to be phishing emails from Truist, but interestingly, these emails are passing SPF, DKIM, and DMARC checks. The emails appear to be originating from…
I'm looking for advice on setting up SPF and DKIM for a customer using Gusto to send emails. They use Microsoft 365, and I want to ensure their…
I've noticed a surprising trend where various IT departments seem to overlook DKIM, DMARC, and SPF settings when they implement third-party services. Is this really as common as…
I've been using IIS SMTP relay for sending notification emails from our devices and products to both internal and external customer domains. While I know a common suggestion…
I've been in the IT field for quite some time, but I've never really dealt with email systems until now. My customer wants to ensure that all outgoing…
I'm hoping to get some clarity on how email authentication protocols like SPF, DKIM, and DMARC affect message delivery to Gmail and Outlook as of 2026. Specifically, I…