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About

InboxFlow simplifies your cold email infrastructure from the get-go. When you buy your burner domains, we automate SPF, DKIM, and DMARC setup. Plus, they're automatically redirected to your landing page, ensuring your prospects never encounter an invalid page. With your domains and email authentication sorted, it's time to supercharge your cold email campaigns. InboxFlow's user-friendly interface empowers you to configure dozens of inboxes across different domains with unprecedented ease. Spend less time on setup and more time connecting with your prospects. InboxFlow's bulk-account upload feature takes your cold email game to the next level. We provide you with a CSV file that allows you to effortlessly import and manage multiple inboxes in your favorite sending tool. Say goodbye to tedious, manual processes, and hello to streamlined efficiency. Simplify cold email infrastructure for unbeatable deliverability.

About

SubsiMail is a self-hosted cold email sequencing platform. Prospect lists, templates, connected inboxes, and all campaign data live in your own database, not a third-party SaaS. It's built as a self-hosted alternative to Instantly, Smartlead, lemlist, and Apollo, with flat per-inbox pricing instead of per-seat fees, full data ownership and export, no content review, and no third-party access to your contacts or campaigns. Runs as a single Docker container on any $5 VPS. Connect Gmail, Outlook, or any SMTP/IMAP inbox; build multi-step sequences with merge fields and reply detection; manage per-user roles (admin/manager/view-only) with a full audit trail; and integrate via a REST API with personal API keys. The first connected mailbox is free forever.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Supported
Cloud Not Supported
On-Premises Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Companies and anyone requiring a solution to manage and send cold emails

Audience

Sales teams, agencies, recruiters, and solo founders running cold email outreach who want to own their data instead of trusting a third-party SaaS with their prospect lists.

Support

Phone Support Not Supported
24/7 Live Support Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Not Supported

Screenshots and Videos

Screenshots and Videos

No images available

Pricing

$45 per month
Free Version Not Supported
Free Trial Not Supported

Pricing

Free (paid plans from $49/mo)
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

InboxFlow
United Kingdom
inboxflow.net

Company Information

SubsiMail
Founded: 2026
India
subsimail.com

Alternatives

Alternatives

Categories

Cold Email Supported

Categories

Cold Email Supported
Email Marketing Supported

Integrations

Gmail Not Supported
Google Sheets Supported
Instantly Supported
Microsoft Excel Supported
Microsoft Outlook Not Supported
Smartlead.ai Supported

Integrations

Gmail Supported
Google Sheets Not Supported
Instantly Not Supported
Microsoft Excel Not Supported
Microsoft Outlook Supported
Smartlead.ai Not Supported
Claim InboxFlow and update features and information
Claim InboxFlow and update features and information
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Claim SubsiMail and update features and information