Named rules, not scores
Every warning shows which rule produced it, so you can judge the finding yourself instead of trusting a mystery score.
Understand why a message looks suspicious.
MailGuard Local adds transparent, local rules to Apple Mail on your Mac. When a message looks suspicious, you see exactly which rule raised the warning — and the Mail extension that evaluated it cannot send message data over the network.
Coming SoonSupport
Warnings that explain themselves
Sender mismatch checks
The free rule explains mismatches between a sender's display name and their actual sending domain — spelled out in plain language.
Inside Apple Mail
Findings appear where you read: a Mail extension evaluates supported message metadata directly inside Apple Mail.
A guard that cannot phone home
No extension network access
The Mail extension cannot send message data over the network, so what it reads while evaluating rules stays on your Mac.
Local evaluation
Rules run against supported message metadata locally on your Mac — nothing about your messages is scored on a server.
More local checks planned
Additional local checks — Reply-To mismatch and first-message-from-address warnings — are planned for the Lifetime Access unlock.
Pre-release availability
MailGuard Local is in pre-release for Mac and is not yet available to download. The free rule explains sender display-name and sender-domain mismatches. Lifetime Access is a planned optional one-time purchase that unlocks additional local checks, including Reply-To mismatch and first-message-from-address warnings — there is no subscription, and the purchase is not publicly available while the app remains in pre-release. This page intentionally provides no App Store offer.
Maker note
Why a warning must name its rule
Opaque spam scores train people to ignore warnings, because a number you cannot interrogate is a number you eventually dismiss. MailGuard Local takes the opposite bet: fewer checks, each one named and explained, evaluated locally by an extension that cannot send your message data over the network. A warning you can understand is a warning you might actually act on.
Daniel · solo developer behind Crafter AppsMailGuard Local questions
What is MailGuard Local?
A Mac app whose Mail extension evaluates supported message metadata with transparent local rules and flags suspicious messages inside Apple Mail, naming the rule behind each warning.
Does it read or upload my email?
The Mail extension evaluates supported message metadata locally on your Mac, and it cannot send message data over the network. Rules run entirely on your machine.
Which platform does it run on?
MailGuard Local is a Mac app that works inside Apple Mail. It is currently in pre-release for Mac.
What is free, and what does Lifetime Access unlock?
The free rule explains sender display-name and sender-domain mismatches. A one-time Lifetime Access unlock is planned for additional local checks, including Reply-To mismatch and first-message-from-address warnings — no subscription. The purchase is not publicly available while the app is in pre-release.
When does MailGuard Local ship?
When it meets the studio bar for a complete, honest release. It is an active pre-release project, so this page carries no App Store badge, price, or promised launch date.