MailFleet

What it is

MailFleet is desktop email campaign software for Windows, macOS and Linux. The home page describes it as "Professional bulk email software for Windows, macOS, and Linux with SMTP/API provider support, approved network profile management, SpamAssassin checks, sending capacity scoring, webhooks, and detailed campaign logs." It does not send mail itself: you connect the SMTP relays and email APIs you already use, and MailFleet becomes the place where you build, schedule, check and monitor campaigns. The FAQ is direct about it: "It is management software, not sending infrastructure."

The site lists its audience as responsible campaign operators, agencies, SaaS teams, technical marketers, newsletter operators, deliverability consultants and internal operations teams. The footer names Secuno LLC as the company behind the product, with an address in Sheridan, Wyoming, USA.

What a sender gets

The app brings the pieces of a campaign into one desktop workspace "for templates, lists, schedules, and provider assignments." The campaign manager lets you "Create, schedule, pause, and monitor permission-based campaigns with full operational visibility across every provider profile." A template builder handles "Reusable templates with variables and previews," and templates can be run through the built-in SpamAssassin checker before sending, which the site describes as "Pre-send content and header analysis before you send."

Sending capacity scoring lets you "Score campaign load against provider limits before launch," so a campaign that would exceed what a provider allows shows up on your desktop first. Proxy management covers "master, campaign-wise, and managed network profile assignment," which the FAQ says is for legitimate network separation and testing; abuse or filter evasion is prohibited by the company's Acceptable Use Policy.

After a send, webhooks push "Real-time campaign events to your stack," detailed logs keep a "Granular event history for troubleshooting and audits," and campaign reports produce "Delivery, bounce, and provider performance summaries you can export for clients and stakeholders." The site stresses that logs stay on your machine; a stat on the home page reads "100% Local log ownership. Your data stays on device."

The workflow on the home page runs in four steps: connect providers and test connectivity, validate before send with SpamAssassin checks, capacity scoring and DNS diagnostics, launch with scheduled sends, webhooks and local logs, then report and iterate with exportable summaries.

Providers you can connect

The provider page says "MailFleet supports Custom SMTP plus Gmail, Outlook/Microsoft 365, Yahoo, Zoho, Amazon SES, SendGrid, Mailgun, Postmark, Resend, and Brevo," each through SMTP, API or both where the vendor offers both. Its coverage summary counts 17 provider presets, made up of 11 SMTP integrations and 6 API integrations, plus custom infrastructure. Provider profiles are unlimited on both licenses.

A custom SMTP profile connects "any RFC-compliant SMTP server," with self-hosted Postfix, Exim or Haraka, agency relays and client-owned infrastructure given as examples. MailFleet stores the host, port, encryption (STARTTLS or SSL) and authentication locally, and you test connectivity before assigning the profile to a campaign. The page reminds users that they "remain responsible for reputation, authentication (SPF, DKIM, DMARC), and provider acceptable use terms."

The provider page separates mailbox relays from sending services. Gmail, Outlook/Microsoft 365, Yahoo and Zoho Mail are described as best for low volume and operational mail. Amazon SES, SendGrid, Mailgun, Postmark, Resend and Brevo are listed as "Transactional ESPs" that "are built for higher throughput." Where a vendor offers both, MailFleet keeps separate SMTP and API profiles, "for example Amazon SES (SMTP) and Amazon SES (API) as distinct profiles you can assign per campaign." Each provider entry carries setup notes, such as moving out of the SES sandbox before large sends, using restricted SendGrid API keys, choosing the correct Mailgun region, and keeping Postmark broadcast and transactional streams apart.

Credentials, the page says, "are stored locally on the device running MailFleet, not on MailFleet sending servers."

Agencies

For agencies, the provider page says you can "Create labeled provider profiles per client or brand and assign them per campaign," then "Export logs from MailFleet for client reporting." The FAQ adds that MailFleet "works well for agencies managing multiple client brands with separate provider profiles, exportable reports, and detailed campaign logs." Separate API keys per client, labeled by environment, keep one client's sending apart from another's.

Free diagnostic tools

The website hosts a set of free browser tools, "All 25 tools" in the home page's words, including an Email Blacklist Checker, SMTP Diagnostics that tests host connectivity, STARTTLS/SSL and AUTH login with verbose protocol logs, a SpamAssassin Checker, SPF, DKIM and DMARC checkers, MX lookup, an email header analyzer, a reverse DNS checker, a BIMI checker, an unsubscribe link checker and a bounce code lookup. The home page says "Production-grade diagnostics ship inside MailFleet desktop."

Pricing

MailFleet is sold as a license, not by volume. The pricing section says "Simple desktop software pricing. No per-contact fees. No per-campaign fees. No per-email fees." There are two options:

• 1 Year License, $49 per year, described as "Best for users who want to test MailFleet in real campaign workflows before committing long term."
• Lifetime License, $79 one-time, "Only $30 more than the 1 Year License," for operators who want "one payment, long-term access, and no recurring software subscription."

Both include the desktop app on all three operating systems, the campaign manager, template manager, SMTP/API provider management, proxy profiles, SpamAssassin checks, sending capacity scoring and webhooks. What you pay your sending provider is separate.

Platforms and requirements

The FAQ says MailFleet runs on Windows 10+ and on macOS 12+ (as a universal DMG and PKG), and on Linux through DEB and RPM packages, with builds for both x86_64 and Arm processors on Windows and Linux.

Responsible use and compliance

MailFleet calls itself "professional email campaign control software" and says it is "not a cheap email blaster." It is meant for "permission-based campaigns and legitimate business communication," not "unsolicited mail, list harvesting, or abuse," and the site links to an anti-spam policy and an acceptable use policy. The FAQ says "Users remain responsible for consent, unsubscribes, and applicable laws such as CAN-SPAM, GDPR, and CASL." It also says MailFleet does not guarantee inbox placement, because "Final delivery depends on sender reputation, authentication, content quality, list quality, and provider rules."

Who it suits and who it does not

MailFleet suits agencies, SaaS teams, newsletter operators and deliverability consultants who already have sending accounts with providers like SES, SendGrid, Mailgun or Postmark, or run their own SMTP server, and want one desktop tool to manage campaigns across them with local logs and pre-send checks. The flat license price, with no per-contact or per-email fees, makes costs easy to plan: the software bill stays the same however large the list grows.

It is less suited to teams that want a hosted, browser-based platform where the vendor handles sending, or to marketers who are not comfortable setting up SMTP credentials, API keys and DNS authentication. The site says as much when it describes MailFleet as built for teams "with the infrastructure literacy to run their own providers."