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Tsukaeru MailBuster

MailBuster is a complete cloud-based security platform for your email. Utilizing advanced machine learning technology, filter out unwanted spam and dangerous malware attacks before they reach your email server and inbox, lowering load and increasing efficiency.

Why email security?

  • You miss important email in between all the spam
  • Worried about opening emails that look like viruses
  • Tired of deleting spam throughout the day
  • Not satisfied with your current email antispam filter quality
  • Need to save costs on security
  • Need to protect against targeted attacks

Mailbusteris the answer!

Mailbuster features a robust threat intelligence engine backed by machine learning and heuristic analysis technology that detects and blocks phishing and ransomware attacks in addition to spam.

How MailBuster works


Incoming Email

Protect your internal systems against inbound spam and virus attacks.mail-buster


Spam, Viruses, Phishing, Ransomware, Malware and other email based network attacks



Protect against unknown spam and malware

MailBuster applies continual improvements in secure data collection and analyses, instantly detecting new patterns and identifying derails. That accumulated intelligence is implemented real-time assuring timely protection against new threats.


Save up to 80% on your email server diskspace and reduce load

MailBuster filters your email before it arrives into your network, significant lowering the required resources of your mail server, and your PCs inbox.


Improve work efficiency with easy email management

Manage your spam mail with easy via our management console. No more wasting time with daily training of your antispam system.


Outgoing filter

Prevent Spam and viruses from being sent from your server and network.


Blacklist protection

It is not uncommon for your mail server to be used to send mass spam when one or more email accounts or workstations have been compromised. This can cause your external IP address to be blacklisted. When you are blacklisted, many other email servers will block any emails coming from you and your colleagues. Outgoing spam protection helps these emails getting out past our MailBuster filter, notifying you of any problems.


Protect your brand and reputation

When spam or viruses are sent from your email server, the receiving party undoubtedly will wonder if your organization has proper security policies in place, damaging the reputation of your brand. Use MailBuster to ensure the integrity and client reputation of your network


Improve abuse manageability

With our Outgoing Filter service you can get clear and concise reports indicating which users or accounts require your attention, automatically locking them when needed.


Tsukaeru MailBuster Features


Proprietary Machine Learning Engine

MailBuster features a robust threat intelligence engine backed by machine learning and heuristic analysis technology that detects and blocks phishing and ransomware attacks in addition to spam.


Filter accuracy

By processing 100s of millions of messages per day, MailBuster is able to continuously improve the accuracy of the filter, to a point where practically 100% of spam is blocked, with very few false positives.


Unbeatable cost-performance

Without the need for a costly on-premise appliance, Mailbuster offers second to none cost performance. From just ¥1,600 per domain including 100 email accounts, our enterprise grade solution cannot be beaten on price, without compromise on accuracy.


Intuitive control panel

You don’t need to be an IT expert to manage MailBuster. Just add your domain and your DNS records will be automatically adjusted as need for domains hosted with us. If you host your domain elsewhere, no problem. Just update 1 or 2 DNS records and you will be protected within minutes.


Maintenance Free

Tsukaeru MailBuster is a dedicated platform that sits between the email sender and email Inbox. We handle all the required updates and patches update with zero downtime. Don’t worry about “training” your spam filter, our filters are accurate enough to catch nearly all spam without your help. In the rare case that spam gets through, just drag and drop the email to report and block future spam.


Save money on mail server resources

Our solution is 100% cloud based, so you there is no need for any agent to be installed on the mailserver, or an appliance to be placed in your office. This lowers not only traffic to your server, but also will reduce server load and diskspace required.

Contact Us


Inbound Filter

Easy to understand per domain pricing
Each domain includes filtering for 100 email accounts

Domain 1 Month 1 Year 2 Years
1 ¥2,200 ¥1,980 ¥1,760
2 ¥4,400 ¥3,960 ¥3,520
3 ¥6,600 ¥5,940 ¥5,280
4 ¥8,800 ¥7,920 ¥7,040
10 ¥11,000 ¥9,900 ¥8,800
25 ¥13,200 ¥11,880 ¥10,560
50 ¥19,800 ¥17,820 ¥15,840
100 ¥27,500 ¥24,750 ¥22,000

* Prices are tax included.

Outgoing Filter

Protect the reputation of your email servers IP address by filtering outgoing email. Don’t let your email server become part of the problem by allowing hacked email accounts to send out endless spam clogging up your email queue, with outgoing filtering for all email being sent from your server.

Domain 1 Month 1 Year 2 Years
1 ¥1,320 ¥1,100 ¥990
2 ¥2,200 ¥1,980 ¥1,760
3 ¥3,300 ¥2,970 ¥2,640
4 ¥4,400 ¥3,960 ¥3,520
10 ¥5,500 ¥4,950 ¥4,400
25 ¥6,600 ¥5,940 ¥5,280
50 ¥9,900 ¥8,910 ¥7,920
100 ¥13,750 ¥12,375 ¥11,000

* Prices are tax included.

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Easy 3 step configuration

Step 1



Choose the number of domains to protect and signup now.

Step 2



Simply login and add your domain to Mailbuster via our control panel.

Step 3


Update your DNS

Point your MX (mail exchange) record to Mailbuster. If you host your domain with Tsukaeru, this is configured automatically.

Contact Us

Office hours:Weekdays 10:00-17:00

Toll Free:

0120 961 166


(+81)03 4590 8198