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Marc's Security Blog

Splunk, Email Security, PKI and more...

To cribl or not to cribl.... (Part 2)

Working on a global project requires onboarding of many new data sources while complying to legal data residency requirements. While this...

Marc Luescher

Nov 4, 20212 min read

DMARC reporting issue when using Cisco Ironport ESA's with 14.0.0-698

We are one of the lucky customers which have completed the onboarding journey of becoming DMARC compliant in reject mode with 99%+ of our...

Marc Luescher

Nov 3, 20212 min read

To cribl or not to cribl....

Working on a global project requires onboarding of many new data sources while complying to legal data residency requirements. While this...

Marc Luescher

Jun 16, 20211 min read

Data Loss Prevention (DLP) with ESA 13.5.3-010

DLP for email is becoming more and more a requirement in the healthcare sector. As part of our rollout we have been piloting with a...

Marc Luescher

Jun 16, 20212 min read

Upgrading Cisco virtual appliances v 14.0

I guess there is always a moment when you get stuck with an upgrade. While trying to upgrade our virtual appliances from v 13.5 to the...

Marc Luescher

Jun 16, 20211 min read

HelpSystems acquires Agari to grow their Data Security Portfolio

I am following the email market closely since many years and there have been recent changes just to name a few : -Mimecast's acquisition...

Marc Luescher

Jun 16, 20212 min read

Agari - APP on Cisco ESA - To forward or not to forward

For users which also have an integration between the Cisco ESA's and Agari ATP or how Cisco calls' it Cisco APP. What should you do in...

Marc Luescher

Oct 9, 20201 min read

Google rejecting Salesforce DKIM signed messages

Another day in troubleshooting email connectivity issues for our end users. This one was a bit harder then usual. Our Salesforce QA team...

Marc Luescher

Oct 8, 20202 min read

Adding a warning message when the from, reply-to and sent by addresses mismatch

This blog article is an addition to the previous blogs about external warning messages based on requests I have received and feature and...

Marc Luescher

Oct 8, 20205 min read

Adding a warning message for external emails as a disclaimer... (part 2)

Every email admin most likely has seen one way or another of tagging external emails. While this sound like a very easy task there are...

Marc Luescher

Aug 22, 20203 min read

Adding a warning message for external emails to the subject... (part 1)

Every email admin most likely has seen one way or another of tagging external emails. While this sounds like a very easy task there are...

Marc Luescher

Aug 22, 20205 min read

What are all those global session limits about for Ironport ESA's ?

And why it is a good idea to understand what they are used for ... For those which prefer to read the Cisco admin manual first to get a...

Marc Luescher

Aug 20, 20208 min read

Combining the best of all worlds for email security - High Level Mail Flow Inbound

We have made the decision over the last 18 months to further strengthen our email security stack for incoming email by combining the best...

Marc Luescher

Aug 19, 20202 min read

New OWA O365 secure email HTML template getting blocked by Cisco ESA URL reputation filters

Another day in troubleshooting email connectivity issues for our end users. This one was a bit harder then usual. A user complained that...

Marc Luescher

Aug 13, 20202 min read

5 reasons on why I just started this blog

I am pretty new to the bloggin world, so today i'm going to give you 5 reasons why I started blogging. Having a source where I could...

Marc Luescher

Jun 11, 20201 min read

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