Do I really need a third-party spam filter?
Built-in protections often catch the same junk as layered third-party tools, making extra contracts hard to justify. However, relying solely on native solutions can cause high rates of false positives and negatives. Making these built-in filters effective requires administrators to manually build and maintain custom rules themselves.
What the numbers show
Counted from the threads quoted below. How we count
- People have been saying this in most months since September 2026.
- This comes up 34.2× more often in r/sysadmin than across the site as a whole.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1Switching to alternative security tools like Turnstile, Cloudflare, or lightweight honeypot pluginsDid this help you?
- 2Removing the plugin if there is no blog or comment sectionDid this help you?
- 3Switching to API-based email security solutions instead of traditional gateways.Did this help you?
- 4Relying on the native filter but writing extensive custom mail flow rules and scripts to complement it.Did this help you?
- 5Running a pilot program with strict policies to compare confirmed misses and false positives before cutting over.Did this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“Hi all WordPress peeps. quick question, have been runnning askimet plugin for about 3 years. I dont run a blog website and any forms I have are created by elementor. do i really need askimet.”source ↗
“Our third-party email spam filtering contract is due for renewal soon, and we're considering whether it's still necessary.”source ↗
“Given that these protections are already included in our Microsoft licensing, I'm questioning whether a third-party solution such as Mimecast or Proofpoint offers enough additional value to justify the cost.”source ↗
“Defender alone was awful for our ~4k mailbox setup. There is not much at all to tune there, we are fully licensed A5 and had malware, junk, etc all set. Way too many false positives and negatives.”source ↗
“moved away from a layered setup to just the built-in stuff a couple years back. haven't regretted it, the false positives from the third party were driving everyone insane and the native filtering caught basically the same stuff anyway.”source ↗
“Full defender here. I can say I’ve got a lot of EXO mail flow rules to complement what Defender does. It is highly effective, but it’s all on me vs a Checkpoint or Abnormal product.”source ↗
Where this came up
People with this problem also raised
- 7Why do self-hosted emails keep going to spam?
- 2Why are legitimate vendor emails going to quarantine?
- 3How to stop an email spam bomb attacking a user inbox
- 9Why is security software generating so many false alerts?
- 8Antivirus blocking legitimate software updates and installers
- 4How do you know if an extra maintenance step is actually required?