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About
DKIM Signing improves the inbox placement of mailbox providers like Gmail, Office365. Multiple Servers in the USA and Europe for increased reliability. No more headaches of managing and maintaining your own email server and IP reputation. Create SPF and DKIM records for your domain names, no prior experience required. If you are suffering from an IP blacklisting our SMTP relay service can solve your reputation problems. 24×7 technical support via phone, chat or email. We are here to ensure your mail gets delivered. you’ll be able to deliver your mail reliably to the inbox. We optimize our sending routes and closely monitor our IP reputations to ensure you the best possible service. We have a Zero Spam Policy that allows us to block or restrict messages that would damage our reliability or the reputation of our customers. You may send from an unlimited number of “From” addresses or domains after you have verified your domain ownership via DNS.
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About
SuperMailOS is managed business email on your own domain for small teams. You bring your domain; SuperMailOS runs the mail server and handles deliverability — SPF, DKIM, DMARC, IP reputation, and warmup — so your email lands in the inbox, not the spam folder.
Setup takes minutes: verify your domain with one-click DNS on Cloudflare, DigitalOcean, and other providers (or guided copy-paste on any registrar), invite your team, and start sending. Every person gets a real mailbox; aliases like hello@ and support@ are unlimited and free.
Webmail is as simple as Gmail — threads, instant search, keyboard shortcuts, labels, dark mode — plus IMAP and SMTP for any mail app, and a live deliverability dashboard showing your mail landing.
Flat pricing per mailbox: Pro $3/mailbox/month annually (10 GB, 3 domains), Business $5 (30 GB, unlimited domains), custom at 50+. 14-day free trial, no credit card.
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Audience
Companies requiring an outbound SMTP service solution to manage and maintain their own email server and IP reputation
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Audience
Small and medium businesses, startups, agencies, and freelancers who want professional email on their own domain without running a mail server or managing DNS and deliverability themselves.
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Support
Phone Support
24/7 Live Support
Online
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Support
Phone Support
24/7 Live Support
Online
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API
Offers API
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API
Offers API
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Screenshots and Videos |
Screenshots and VideosNo images available
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Pricing
$4 per 2,500 messages
Free Version
Free Trial
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Pricing
$3/month per mailbox
Free Version
Free Trial
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Reviews/
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Reviews/
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Training
Documentation
Webinars
Live Online
In Person
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Training
Documentation
Webinars
Live Online
In Person
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Company InformationOutboundSMTP
United States
www.outboundsmtp.com
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Company InformationSuperMailOS
Founded: 2026
supermailos.com
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Alternatives |
Alternatives |
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Categories |
Categories |
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Integrations
Gmail
Microsoft 365
Microsoft Outlook
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