[Case Study] How DMARC Analytics Helps Save Domain Reputation

GlockApps (G-Lock Software)
2 min readNov 2, 2021


Like all companies doing business online and communicating with their clients via email, we, at GSoft, are concerned about our domain reputation. To protect the domain and ensure that nobody is sending spam or phishing emails on behalf of our company, we implemented DMARC email authentication with the ‘reject’ policy.

We thought it was enough to be protected and we were not monitoring our DMARC data in GlockApps DMARC Analytics regularly. But thanks to the GlockApps alert system, we realized that we were wrong.

Below I share our case on how GlockApps alerts helped us find and fix a critical issue with our domain.

To give you some background, here at GSoft, we have a few mailboxes set up on the same domain: support@ourdomain.com, abuse@ourdomain.com, info@ourdomain.com, bounce@ourdomain.com, and press@ourdomain.com.

The volume of outgoing mail is low — around 100–150 emails a day. These are mostly emails sent by our tech support team from support@ourdomain.com. The other email accounts are not used for email sending and are only monitored from time to time.

As aforementioned, we set the ‘reject’ DMARC policy for the ourdomain.com domain and outsourced the collection of DMARC reports to GlockApps DMARC Analytics.

One day, we received an alert from GlockApps saying

We detected an unusual message count 1376 (+108.00%) for the domain my_company.com on 2021-09-05.

We made the mistake of not paying attention to it at that time. A few days later on, we logged in our dashboard in GlockApps and found this:

GlockApps DMARC Analytics: sent email volume

The volume of emails sent from our domain increased a few times over the past few days, and it was not a spoofing campaign as the messages were sent from our mail server and from our IP address, and also passed DMARC authentication. So we were confused as to what was going on.

We started the investigation and asked our support team if they had sent any mass mailings in recent days. They said “no.” The admins looked at the logs of our SMTP server and… what a surprise! Spammers hacked one of our mailboxes and started sending spam with links to porno sites. They had sent a few thousand spam messages before we saw the issue. Obviously, it couldn’t stay overlooked by the ISPs.

The consequences were immediate.

Read the full story on GlockApps blog.



GlockApps (G-Lock Software)

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