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WarmEnvelopes
What it is
WarmEnvelopes schedules warm-up emails from a configured domain through the user's Resend account to recipient inboxes they control, helping build sending history. Setup requires a verified sending domain and a Resend API key, with a separate key stored for each domain. A scheduler runs every 30 minutes and spreads the daily target across the day; Pro users can set the starting volume, increase, and maximum. The service says its library contains more than 1,000 independently written messages in several languages, with templates and sender names randomized. A dashboard tracks daily progress, while the sending log lists the sender, template, delivery status, and any error. The service says it sends genuine messages rather than using shared inbox pools, bot opens, automated replies, or spam-folder rescues. The Free plan costs nothing and allows 4 emails per day per domain across up to 10 domains. Pro costs €9 a month and supports up to 1,000 emails per day. A separate no-sign-up checker checks SPF, DKIM, DMARC, MX, and blocklist status.
For and against
For
- Scheduling distributes daily targets throughout the day.
- Free plan supports up to 10 domains.
- Sending logs include delivery status and errors.
- A no-sign-up checker checks SPF, DKIM, DMARC, MX, and blocklists.
Against
- Requires a verified sending domain and Resend API key.
- Does not guarantee inbox placement.
- Does not fix broken DNS, poor recipient lists, or spam-like content.
- Sign-in is via Google.
The verdict
WarmEnvelopes provides scheduled sending, configurable ramps on Pro, and logs for domain warm-up activity. It depends on a verified domain and Resend account, and does not promise inbox placement.
Who it suits
It suits users warming domains they own or are authorized to manage, with recipient inboxes they control or whose owners consented to receive messages.
Plans and prices
Free
4 warm-up emails/day per domain · up to 10 domains · sending log and filters · no credit card
Read 15 Oct 2026 · warmenvelopes.com
Pro
1–50 starting emails/day · 0–50 daily increase · up to 1,000 emails/day · up to 10 domains
Read 15 Oct 2026 · warmenvelopes.com
On the record
- Acceptable use
- Users may only configure domains they own or are authorized to manage and recipient inboxes whose owners consent to receive the messages.warmenvelopes.com · read 15 Oct 2026
- Account access
- Users sign in with Google.warmenvelopes.com · read 15 Oct 2026
- Authentication
- Warm-up messages are described as SPF, DKIM, and DMARC aligned when accepted by the receiving mailbox.warmenvelopes.com · read 15 Oct 2026
- Compliance
- The privacy policy gives users GDPR access, correction, deletion, restriction, objection, and portability rights.warmenvelopes.com · read 15 Oct 2026
- Data handling
- The privacy policy says WarmEnvelopes does not read users' inboxes, sell or share data for advertising, or use analytics cookies unless accepted.warmenvelopes.com · read 7 Oct 2026
- Data stored
- Stored configuration includes domains, Resend API keys, ramp settings, and recipient inbox addresses.warmenvelopes.com · read 15 Oct 2026
- Domain checker
- A free checker without sign-up tests SPF, DKIM, DMARC, MX, and blocklist status.warmenvelopes.com · read 15 Oct 2026
- External context: Gmail monitoring
- Google recommends monitoring server responses, spam rate, and sending-domain reputation while increasing volume.support.google.com · read 15 Oct 2026
- External context: Gmail pacing
- Google advises senders to start with low volume, increase gradually, send consistently, and avoid bursts.support.google.com · read 15 Oct 2026
- External context: Gmail spam threshold
- Google's sender FAQ says senders should keep spam rates below 0.1% and avoid reaching 0.3% or higher.support.google.com · read 15 Oct 2026
- External context: industry guidance
- M3AAWG publishes sender best-practice guidance covering technical and policy aspects of commercial electronic messaging.m3aawg.org · read 15 Oct 2026
- External context: Resend API
- Resend's pricing documentation lists a RESTful API and official SDKs as sending capabilities.resend.com · read 15 Oct 2026
- External context: Resend free quota
- Resend's Free plan allows 3,000 emails per month and 100 emails per day, so WarmEnvelopes sends share that quota.resend.com · read 15 Oct 2026
- External context: Resend paid pricing
- Resend lists Pro at $20 per month for 50,000 emails and no daily email limit.resend.com · read 15 Oct 2026
- External context: Spamhaus ZRD
- Spamhaus says newly observed domains are placed on its Zero Reputation Domain list for 24 hours and then removed automatically.spamhaus.org · read 15 Oct 2026
- Integration
- It requires a verified sending domain and a Resend API key, and each domain stores its own key.warmenvelopes.com · read 7 Oct 2026
- Intended audience and use
- The service is for warming domains the user owns or is authorized to manage, using recipient inboxes they own or whose owners consented to receive warm-up mail.warmenvelopes.com · read 7 Oct 2026
- Limit: deliverability scope
- WarmEnvelopes says it does not repair broken DNS, poor recipient lists, or spam-like content.warmenvelopes.com · read 15 Oct 2026
