Mailyser

Mailyser is an email deliverability platform built for email marketers and deliverability specialists who need to know whether a campaign will reach the inbox before it is sent. The product runs pre-flight tests against monitored seed accounts to predict whether an email will land in the inbox, in junk, or not at all, then reports on spam score, authentication, blocklists, spam traps, email structure, and broken links. Alongside testing, its Vitals dashboard consolidates reputation monitoring for every sending domain and IP address, drawing on Google Postmaster, Microsoft SNDS, and DMARC reporting. AI-powered actions turn each finding into a specific fix and generate content recommendations aimed at improving both placement and engagement. Brands listed as customers on the company's site include Coinbase, San Miguel, Estrella Galicia, and Pull & Bear.

Features

     
• Pre-Flight Placement Testing: Test emails are sent to monitored seed accounts to predict inbox, junk, or undelivered outcomes before a live campaign goes out.
     
• AI Spam Score: An AI-generated score assesses the data points that drive placement and identifies what is pulling the result down.
     
• Content and Structure Analysis: Emails are checked for spam trigger language, image-to-text ratio, accessibility, and readability, with recommendations attached to each issue.
     
• Link and Blocklist Checks: Every URL is verified as live and blocklists are checked in real time, with guidance on resolving any listing.
     
• Vitals Monitoring: One dashboard tracks reputation across all domains and IPs by connecting Google Postmaster, Microsoft SNDS, and spam complaint data.
     
• Mailyser DMARC: DMARC records are set up and monitored, with reports that surface authentication failures and spoofing attempts.
   

Pricing

Mailyser prices by tests and domains rather than by seat:

     
• Free: $0. One test, one domain, and one seat, covering spam score, DKIM, SPF and DMARC authentication, inbox placement testing, and blocklist checks.
     
• Pro: $450 per month. 50 tests per month across two domains with unlimited seats, adding the GPT assistant and online support.
     
• Enterprise: $12,000 per year. 1,000 tests per month across five domains with unlimited seats, the Vitals monitoring suite, and a dedicated account manager.
   

Add-ons are priced separately: an additional domain costs $150 per month or $1,500 per year, additional tests cost $150 per five tests monthly or $1,500 per five tests annually, and an additional IP costs $1,500 per year. A free test can be run without a subscription, and the company offers custom quotes on request.

Pros

     
• Visibility Before Sending: Placement problems surface ahead of the campaign rather than after a poor send.
     
• Fixes, Not Just Diagnostics: Each issue is paired with an explanation of how to resolve it, which suits teams without a dedicated deliverability specialist.
     
• Unlimited Seats: Paid plans are not priced per user, so a whole marketing team can access results.
     
• Consolidated Monitoring: Vitals brings Google Postmaster, Microsoft SNDS, DMARC reporting, and blocklist status into one view instead of several separate consoles.
     
• Free Entry Point: A free plan and a one-off free test let buyers see real output before paying.
     
• Fits an Existing Stack: The company states compatibility with major sending platforms and documents an API for custom workflows.
   

Cons

     
• Steep Jump to Paid: The free plan allows a single test on one domain, so any sustained use requires the $450 per month Pro plan.
     
• Tight Domain Allowances: Pro covers two domains and Enterprise five, with each additional domain charged at $150 per month.
     
• Monitoring Sits in the Top Tier: The Vitals reputation and DMARC monitoring suite is listed only on the $12,000 per year Enterprise plan.
     
• Not a Sending or Warm-Up Tool: Mailyser diagnoses and monitors deliverability but does not send campaigns or warm mailboxes, so it works alongside other tools rather than replacing them.
     
• No Public Reviews: The G2 profile carries no verified reviews, leaving little independent evidence of performance.