The choice here is between the protection that comes with the email or productivity suite you already use and a dedicated layer you add on top. In this guide, email security solutions are the tools and services that filter and check a firm’s email for threats such as phishing and malware, and we compare them in two categories. Our rule bases the choice on what you have switched on, who will run it and what a test of your own mail shows. This guide is for an IT manager or owner at a firm in India or the GCC. We don’t rank products here, and we name no suite or vendor.
Last reviewed 2026-11-01 by Manish Sharma.
Email Security Solutions: Two Categories to Compare
We describe these two categories in our own working words, not in any standard definition. The descriptions say nothing about what any product does or misses, and the questions in the rest of the guide are our own method.
On filtering, the UK NCSC’s Phishing attacks: defending your organisation, reviewed in February 2024 and aimed at technology, operations or security staff who design and implement defences for medium to large organisations, says to filter or block email for spam, phishing and malware before it reaches users.
This guide ranks no product, names no suite or vendor and quotes no price. It helps you decide which category to test first, and what to ask before you change anything.
Email Security Solutions Compared on Five Questions
You can compare both categories on the same five questions. The table is our own working comparison. It lists what to ask, but it does not report findings about any product.
| Question | Built-in suite protection | Dedicated email security layer |
|---|---|---|
| Who supplies it? | The provider of your mailboxes, since it comes with the suite. | A separate supplier, and you manage a second relationship. |
| What do you start with? | Ask what your plan includes and what you have switched on, then confirm both in your suite’s documentation. | Ask the supplier what it covers from the first day, and write down the scope you want. |
| What does it ask of your staff? | How much of this is already set up, and by whom? | Who would set up and run a second system, and how much of the suite’s own set-up still applies? |
| What changes in mail flow? | Does mail need a new route? It already runs through the suite. Ask what changes when you switch a feature on. | Ask the supplier how mail reaches the layer, and what, if anything, you would change and test. |
| Who acts after delivery? | Ask who can find a delivered message and remove it from mailboxes, and how long that takes. | Ask the same, and whether the layer does it or your suite’s administrators do. |
Key Takeaway Treat each question as one to put to a supplier, not as a finding about any product.
Check the Built-In Layer Before You Add Another
The NCSC’s phishing guidance says that if you use a cloud-based email provider, you should make sure its filtering or blocking is sufficient for your needs and switched on by default for all your users. It adds that the rules need tuning to your organisation and may change over time: filtering to a junk folder adds work for users, and blocking can lose genuine mail. Until you have checked both, a test of the built-in layer is not a fair test. That reading is ours.
The same guidance says some phishing attacks will get through, and it sets out four layers of defence. Filtering is one part of the first layer. The other three are helping staff spot and report phishing, limiting the damage from an attack that works, and responding quickly.
The NCSC’s email security and anti-spoofing guide, written for cyber security professionals and the public sector and dated October 2019, covers how to make it difficult for others to send fake email from your own domains with Sender Policy Framework (SPF), DomainKeys Identified Mail (DKIM) and Domain-based Message Authentication, Reporting and Conformance (DMARC). It also covers protecting mail in transit with Transport Layer Security (TLS). You set SPF, DKIM and DMARC on your own domains. Setting them up is a task of its own, but that grouping is ours, not the NCSC’s wording. The NCSC’s phishing guidance also advises that, for inbound email, you should honour the anti-spoofing policies of the sender’s domain. Before you compare, ask any supplier what its product does with SPF, DKIM and DMARC. NIST also publishes Trustworthy Email, SP 800-177 Rev. 1 (February 2019), named here as further reading.
Email Security Solutions: A Four-Step Decision Rule
Work through four steps in order. The rule is Signisys’ own working method, built on the NCSC points above, and it is not a standard. Use it when choosing email security solutions for a firm with a suite.
Confirm that you have switched on the filtering your provider supplies for every mailbox and that it fits your needs; the NCSC gives this advice for a cloud-based email provider. Fix any gap in the policies before you judge the suite.
Look at what staff reported and what reached inboxes after you checked and adjusted the suite. If a kind of message reached people, you have a gap to test a second layer against.
Decide who will run the layer, and ask the supplier what that person must do. If nobody can, name an owner before you buy anything.
List the staff time and mail-flow changes you expect a second system to bring, and try them on a small group of mailboxes before everyone.
Stay with built-in protection when you have done step 1 and step 2 finds no gap. Step 2 sees only what staff reported or you found, so a quiet result is not proof that nothing got through. Add a dedicated layer when step 2 finds a gap, step 3 has an owner and step 4 is acceptable. When step 2 finds a gap and step 3 has no owner, fix ownership first. A layer with no owner is one more system to look after. For checks to run, see a checklist for your mail set-up.
What This Guide Leaves Out, and Where to Go Next
This guide compares two categories and gives a rule, but it leaves out the tool types, which our email security glossary entry explains, and it gives no set-up steps, no scored checklist and no price. For set-up, follow the nine set-up steps, in order. It also leaves out business email compromise, data loss prevention, phishing training and Indian or GCC rules. For what can go wrong in a mailbox, see the risks that reach a mailbox.
For wider phishing guidance, CISA, the NSA, the FBI and MS-ISAC published Phishing Guidance: Stopping the Attack Cycle at Phase One in October 2023. Its landing page says the guidance for network defenders applies to all organizations and that it tailors one section to small and medium-sized businesses. We have not reviewed the full guide for this article. The route from these choices to a protected inbox is on the page for securing business email and collaboration tools, and the device side of this decision is in choosing protection for laptops and servers.
Advantages
Limitations
Key Takeaway Use the rule to test your own mail, not as a verdict on any product.
Our Endpoint, Network and Zero Trust Security solution includes email and collaboration security: protection against phishing, malware and data leaks in everyday tools, with the scope agreed in the engagement. Signisys offers these services. Our Endpoint, Network and Zero Trust Security solution and our Cybersecurity Services page describe them.
Email Security Solutions FAQ
What are email security solutions?
Is built-in email protection enough?
When should a firm add a dedicated layer?
Does a dedicated layer replace SPF, DKIM and DMARC?
Can this guide recommend a product?
Security Insights, Delivered.
Practical, vendor-neutral analysis of threats, tools, and architecture decisions.