The best email warmup tools, curated
Every tool that warms mailboxes, watches inbox placement, or fixes the DNS underneath your cold email, in one curated list. Built for outbound teams, lead-gen agencies, and founders who need replies to start with delivery.
Editor-curated: every listing is hand-reviewed, and anything that doesn't clear the bar comes down.
12 tools

Warmy.io
Automated warmup and deliverability monitoring covering both business and consumer mailbox providers.
Folderly
Email deliverability platform with ongoing inbox placement monitoring, for B2B outbound teams.

GlockApps
Inbox placement testing and reputation monitoring for senders tracking delivery across Gmail, Outlook, and Yahoo.

Mail-Tester
Single-message spam scoring for senders checking a template and its authentication before a campaign goes out.

MXToolbox
Blacklist and email delivery monitoring for the teams responsible for a company sending domain.

EasyDMARC
SPF, DKIM, DMARC, and BIMI management for organizations moving a domain to an enforcement policy.

dmarcian
DMARC report processing and deployment tooling for teams authenticating one or many sending domains.
PowerDMARC
Email authentication suite covering DMARC, SPF, DKIM, BIMI, MTA-STS, and TLS-RPT, for domain owners and MSPs.

Mailforge
Bulk domain and mailbox provisioning for agencies and teams running cold email at scale.

Zapmail
Managed Google Workspace and Microsoft 365 mailbox provisioning for agencies running cold outreach at volume.

Maildoso
Private SMTP mailbox and domain infrastructure for B2B teams scaling outbound sending capacity.
Inframail
Microsoft-backed inbox infrastructure with flat-rate pricing, for lead-gen agencies running many sending domains.