No third-party ESP fees. Your Gmail account, your deliverability, your control.
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Gmail-Native Sending
Emails go out through your actual Gmail account via OAuth — maximizing inbox deliverability with zero ESP markup.
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A/B Variant Testing
Create multiple subject/body variants per campaign. MailFlow distributes them evenly so you can test what resonates.
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Pause & Resume
Need to stop mid-campaign? Pause anytime with a single click. Resume from exactly where you left off — no duplicates.
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Follow-up Threads
Send follow-ups that arrive as replies in the same Gmail thread — not new emails. Target all recipients, only sent, or only failed.
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Multiple Gmail Accounts
Connect several Gmail accounts and rotate senders automatically to stay within daily send limits.
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Real-time Progress
Live send logs, per-recipient status, and a live progress bar — all visible while the campaign runs in the background.
How it works
Up and running in minutes
No complicated setup. Just connect Google and start sending.
1
Sign in with Google
Authorize MailFlow via Google OAuth. We request only the Gmail send scope — nothing else.
2
Create a campaign
Name your campaign, paste your recipients, write your email with A/B variants, and choose your sending delay.
3
Hit send
Watch emails go out in real time. Pause, resume, or follow up — all from the campaign dashboard.
FAQ
Common questions
Yes — MailFlow is completely free to use. You only use your own Gmail account to send, so there are no per-email charges.
When you create a follow-up campaign, MailFlow sends each follow-up as a reply in the same Gmail conversation thread as your original email — so recipients see the full context.
Absolutely. Click Pause on any active campaign and sending stops after the current email completes. Click Resume to continue from exactly where you stopped.
Gmail accounts typically allow 500 emails/day for regular accounts and up to 2,000/day for Google Workspace. MailFlow respects these limits via configurable per-email delays.
MailFlow stores the email content you enter to power sending and follow-ups. Your Gmail OAuth tokens are encrypted at rest.
Ready to send at scale?
Connect your Gmail in seconds and launch your first campaign today — free.