Run cold outreach on your own providers and mailboxes, distribute sending across quotas, and operate sequences, suppression, and team workflows from one platform. No resold sending. No lock-in. No shortcuts that break reputation later.
Mailers.io handles outbound sending, routing, and compliance. It does not include reply management or a shared inbox — replies land in the mailboxes tied to your sending identities, where they belong.
Most cold outreach pain is not a copywriting problem. It is a sending-infrastructure problem — caps, reputation, compliance, and operations. Mailers.io exists for those four problems, specifically.
Single-provider setups hit throttles, daily caps, or policy tightening — usually right when a campaign is working. You lose sends, reputation, or both.
Result: sends dropped, schedules broken, operators firefighting.
Complaints or spam traps on one domain or IP can take down the entire sending profile when everything sits on one reputation pool.
Result: blended reputation collapses, transactional + cold suffer together.
Global unsubscribe, bounce isolation, complaint handling, and do-not-contact lists need to be enforced at send time — not retroactively from reports.
Result: exposure to regulators, blocklists, and trust damage.
Multiple operators, agencies, and clients all touching the same sending stack need custom roles, workspace isolation, and audit trails — not shared logins.
Result: ungoverned access, accidental overwrites, no accountability.
Serious cold senders run on a stack — multiple providers, multiple domains, clear reputation boundaries. Mailers.io is the control layer that makes that stack operable by a team rather than held together by one person's spreadsheet.
Separate cold outreach from transactional and marketing across different providers and domains. One reputation event never poisons the whole program.
Combine providers and mailboxes to build predictable hourly and daily capacity. No more guessing when a single account will throttle.
Add providers and domains as volume grows. No re-platforming, no rewriting integrations, no swapping SDKs. Same API, more capacity.
Mailers.io never bypasses provider limits. It respects them, operates inside them, and helps you build a sending stack that survives policy tightening.
Configure per-provider hourly and daily caps, priority, and eligibility. Mailers.io routes each cold email to the best in-cap provider at send time — policy-respecting, rule-based, and fully controlled.
Live sending pool · cold
4 providers · 1 policyAmazon SES · primary
cold outreach
Mailgun · fallback
cold outreach
SMTP relay · eu
cold outreach · EU
Gmail mailbox pool
low-volume · warm-up
Rule 01
Prefer SES until hourly cap hits 90%, then shift overflow to Mailgun.
Rule 02
Route EU recipients through the EU SMTP relay for data residency.
Rule 03
Gmail mailbox pool limited to warm-up and low-volume sequences only.
Build multi-step outreach with time, event, and condition-based logic. Every step goes through the router, checks suppression, and runs inside your provider limits — no surprise bursts, no unsafe sends.
Wait 2 days, send step 2. Wait 5 days, send step 3. Quiet hours and sending windows respected per workspace and per recipient timezone.
Kick off a sequence when a form is submitted, an API call adds a subscriber, or a previous automation fires. Every step is quota-aware.
Split sequences by list membership, tags, suppression status, or custom attributes. Skip steps for contacts who unsubscribe or hit suppression at any point.
Sequences handle outbound steps — sending, waiting, branching, stopping. Replies are read and managed in the mailboxes tied to your sending identities, outside of Mailers.io.
Every cold email is checked against global, domain, workspace, list, and automatic suppression records before it leaves the platform. Unsubscribes stay unsubscribed, bounces stay bounced, complaints stay blocked — across every provider.
Required by modern cold outreach: List-Unsubscribe headers and one-click unsubscribe (RFC 8058) are enforced on marketing and cold sends, aligning with Gmail and Yahoo bulk sender requirements.
Any unsubscribe is honored across every list, campaign, and sequence in the workspace. Re-adding the same contact through import or API does not reset their choice.
Hard bounces and spam complaints are suppressed automatically. Provider signals are normalized into one suppression record so nothing leaks between pools.
Maintain an account-wide DNC list by email, domain, or pattern. Useful for competitors, partners, regulated industries, or specific enterprise accounts.
Suppression can be scoped per workspace or per sending domain — the right separation for agencies and multi-brand teams where one list should not bleed into another.
Cold outreach has grown past single operators. SDR teams, agencies, and in-house ops groups all touch the same sending stack. Mailers.io gives them the role system, isolation, and audit trail they need — without slowing anyone down.
Create roles that match how your team actually operates — SDRs, campaign managers, deliverability, ops. Assign people to the right scope, not the whole workspace.
Full Access or Read Only on campaigns, lists, automations, templates, forms, sending servers, and sending domains. SDRs can ship; ops can govern infrastructure.
Every action — campaign launches, suppression edits, routing changes, key rotations — is logged with actor, time, and context. Exportable for security and client reporting.
Agencies and multi-brand teams keep lists, sending domains, suppression, and audit logs separate per client. No cross-contamination of data or reputation.
No hype, no inbox magic. Straight answers about what Mailers.io does and does not do for outbound operations.
Connect your providers, define your quotas, and let Mailers.io handle routing, suppression, automation, and team governance. You keep the reputation. We run the control plane.
