Is This a Phishing Scam Using a Legitimate Odoo Tenant?
I received a strange job invitation claiming to be from Bolt and investigated whether it was phishing. The message came from [email protected], and SPF, DKIM, and DMARC all…
email authentication
Why are PaperCut emails suddenly failing DMARC in Exchange Online?
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…
Exchange Online Suddenly Rejecting Emails from PaperCut Due to 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…
How to Set Up an Exchange Hybrid with Microsoft 365 Without Authentication Issues?
I'm new to posting but have been following discussions for a while. I need help with a client's setup for an Exchange Hybrid arrangement with Microsoft 365. I've…
Struggling with DMARC Monitoring: What Tools Should I Try?
I'm finding it really tough to keep up with DMARC reports for half of our domains. The manual process of digging through raw XML reports is driving me…
What Do Secure Email (S/MIME) Certificates Really Guarantee?
I'm curious about the actual usefulness of Secure Email (S/MIME) Certificates. I understand the technical aspects: the email sender signs their messages using a private key, while the…
Why is my SPF failing?
I sent an email using my domain hetnet.nl, but the recipient using Outlook is getting an SPF failure message. The SMTP IP addresses I used (195.121.94.135, 195.121.94.185, 195.121.94.138)…
Why Are Our Emails Still Ending Up in Spam?
I've recently fixed the SPF, DKIM, and DMARC records for our domain because they were not properly set up before I joined the team. I tested them using…
How to Fix DKIMSigningConfig Reporting FALSE?
I've set up DMARC and SPF for my email configuration, but I just discovered that the DKIMSigningConfig is reporting FALSE. I'm not too familiar with PowerShell and was…
Do I need SPF records for subdomains that aren't used for sending mail?
I recently got some advice from a colleague at ncsc.gov.uk about some DNS concerns, and I'm trying to clarify the rules around SPF records for my subdomains. We…
Why Would a Major Client Not Have SPF Records?
I'm curious about a situation with a big client of mine who doesn't appear to have any SPF records published. Tools like Mxtoolbox and dmarcly confirm that there…
What are the common fixes for DMARC issues after setting up DKIM?
I've been reading about setting up SPF, DKIM, and DMARC. They say to start with p=none for monitoring, but I keep hearing about 'fixing issues' before switching to…