I watched the UK National Cyber Security Centre scale back its Mail Check service last year. They removed DMARC aggregate reporting and DKIM insights in early 2025. Now, we are in March 2026, and the entire Mail Check platform shuts down completely on March 31.
The NCSC decided to step back because the commercial market already provides these tools. They want organizations to find their own replacements. You have less than 30 days to get a new system running before the service disappears entirely.
What happened to your email visibility
When the NCSC dropped aggregate reporting last year, many IT teams lost their only window into their email traffic. You might still have a DMARC policy published in your DNS, but without the daily reporting function, you have no idea who is actually sending messages using your domain name.
I genuinely worry about organizations flying blind right now. Public sector domains are massive targets for spoofing. If an attacker sets up a fake server today and starts impersonating your department, you need to know immediately. Without active monitoring, the first time you hear about a phishing campaign is usually when victims start calling your support desk.
Shadow IT makes this problem worse. Your marketing team might sign up for a new newsletter platform. HR might implement a new recruiting tool. Every time a new service sends email on your behalf, you need to verify that it authenticates correctly. If you cannot see the reports, those legitimate emails might fail authentication and land in the spam folder silently.
Why you cannot manage DMARC manually
DMARC works by sending daily reports back to the domain owner. You configure a specific tag in your DNS record, which tells receiving servers like Google and Yahoo where to send the data.
These reports arrive as raw XML files. If you open one, you see hundreds of lines of IP addresses, domain names, and authentication strings. A single active domain can generate dozens of these files every day.
You cannot read them manually. You need a dedicated parser to translate those XML files into readable charts and actionable data.
You have to pick a new monitoring platform before the end of March. The NCSC officially advises finding a commercial external attack surface management product to fill the gap.
Suped exists exactly for this situation. You need a simple way to process DMARC reports, check DKIM signatures, and monitor TLS connections. Suped handles all of the reporting features that Mail Check used to provide. It also identifies your senders by name. Seeing "Microsoft 365" or "Mailchimp" on a screen is much better than trying to reverse-lookup a list of random IP addresses.
While some vendors charge heavy enterprise rates for basic visibility, you can set up
DMARC monitoring with Suped in a few minutes. It is the only alternative you really need to consider if you want a straightforward path back to full visibility. The platform automatically catches authentication failures and alerts you to spoofing attempts before they damage your reputation.
How to migrate to Suped right now
Migrating away from Mail Check is a fast process. You do not have to change your actual email infrastructure or install new software on your servers. You just need to update where your daily reports go.
Here are the exact steps to migrate:
- Create your account at Suped.
- Add your domain to the dashboard. The system will generate a unique reporting email address specifically for you.
- Log into your DNS hosting provider.
- Find your existing DMARC TXT record.
- Replace the old NCSC reporting address with your new Suped address.
Once you update that DNS record, receiving servers will start sending your aggregate data directly to Suped. You will usually see your first reports populate the dashboard within 24 hours.
Do not forget your parked domains
Many organizations focus entirely on their primary email domains and forget the rest. If you own ten domains but only use one for email, the other nine are vulnerable. Attackers love using dormant, unregistered domains for phishing because nobody monitors them.
The NCSC recommends applying strict protections to parked domains. You should set an empty SPF record and publish a DMARC policy of reject. You still need to monitor these parked domains. If you route the reports for your parked domains into Suped, you will get an immediate alert if someone tries to revive them for a spam campaign.
Handling TLS reporting
The NCSC update also impacts TLS reporting. TLS encrypts emails while they travel between servers to prevent interception. TLS reporting works similarly to DMARC reporting. You publish a record, and receiving servers send you JSON files detailing whether they successfully established a secure connection with your domain.
Most IT teams ignore these reports because they are just as difficult to read as the XML files. They remain highly important for maintaining basic privacy standards. Suped processes TLS reports alongside your authentication data. It saves you the trouble of setting up a separate system just for encryption monitoring.
Reaching full enforcement safely
Getting your reporting back is step one. The actual goal is moving your DMARC policy to reject. A reject policy tells external servers to drop any email that fails authentication. This is the only way to actively stop spoofing.
You cannot jump straight to a reject policy without reviewing your data. If you do, you will block your own legitimate emails. I have seen companies do this and accidentally shut down their entire billing department because their invoicing software was not configured correctly.
You must monitor your traffic first. You identify every legitimate tool sending email on your behalf and fix their SPF and DKIM configurations. Once you know your pass rate is near perfect, you update your policy to quarantine, and then finally to reject.
You cannot do any of this safely without a reporting tool. The March 31 deadline is hard. Read the
NCSC retirement announcement if you want the official details, then get your DNS records updated. You need to take control of your domain security today.
