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ZapSMTP / Deliverability

See the signals.
Protect your sending.

Check a draft before sending, inspect domain and IP reputation, and build a sending history with automatic warmup.

Start for free Read the guide
The ZapSMTP overview for Halden Outfitters: sent, delivered, opened and bounced over the last week, with deliveries by mailbox provider.The ZapSMTP overview for Halden Outfitters: sent, delivered, opened and bounced over the last week, with deliveries by mailbox provider.

Authenticate
before sending.

The records to add, each with its status, checked again automatically.

Check a domain
A domain being set up in ZapSMTP: the DNS records to add, each with its status.A domain being set up in ZapSMTP: the DNS records to add, each with its status.
The DNS records to add for a new domain, on a phone.The DNS records to add for a new domain, on a phone.

Inspect a draft
before it goes out.

SpamAssassin and rspamd score the message as receiving servers see it, with fixes to make.

A spam check and deliverability insights for Halden’s shipping email: a plain-text version suggested, under Gmail’s clipping limit, HTTPS links, a replyable sender.A spam check and deliverability insights for Halden’s shipping email: a plain-text version suggested, under Gmail’s clipping limit, HTTPS links, a replyable sender.

Protect your
reputation.

Hard bounces and complaints are suppressed automatically, so you never send to them twice.

Halden’s suppressions in ZapSMTP: hard bounces, an unsubscribe and a complaint, each added automatically with the email that caused it.Halden’s suppressions in ZapSMTP: hard bounces, an unsubscribe and a complaint, each added automatically with the email that caused it.

Also included

Domain reputation, not only IP

Monitor domain and IP listings across Spamhaus ZEN & DBL, Barracuda, SpamCop, Mailspike, PSBL, UCEPROTECT, SURBL, and URIBL.

A pause when your IP needs attention

An affected sending IP pauses automatically on a critical listing and resumes after delisting. Protection of the last sender in a shared pool is handled separately.

A sending history built gradually

A 30-day warmup grows from 50 to 300,000 emails a day. Warmup pauses itself on high bounce or deferral rates.

BIMI support

Configure your brand’s logo for supported mailbox providers. Display and certificate requirements depend on the receiving provider.

Plans and limits

Send your first email.

Your next email starts with a few lines of code.

Start for free 3,000 emails/month free · No credit card required