Home › Store › Developer tools › Letterkeel

LetterkeelSend email, mail merges and CSV digests from your own domain · by CyberMax

Email anyone from your runs, apps and AI agents

Name: Letterkeel
Brand: CyberMax
SKU: letterkeel-send-email
Price: 0.001 USD
Availability: InStock

$0.001 per email sent, failures and dry runs free

▶ Try it free on Apify

Letterkeel: Email anyone from your runs, apps and AI agents

$0.001 per email sent, failures and dry runs free

▶ Try it free on Apify No Apify account? $29/month by card

Give it your SMTP login or a Resend, SendGrid, Mailgun or Postmark key; it sends alerts, run digests with CSV and mail merges from your own domain, for $0.001 per email.

Runs on ApifyFailed results freeHuman support

Runs on your own Apify account
Pay only per result; failures are free
REST API, schedules and MCP for AI agents
Human support: cybermax.tools@gmail.com

See a real result

Mode	Subject	Attachments	Result	Time	You pay
digest (monitor mode)	1 new result (2026-09-24)	results-2026-09-24.csv	250 Accepted	1.6 s	$0.001
single, 2 recipients	Letterkeel live test one	dummy.pdf, note.txt	250 Accepted	1.5 s	$0.002
merge	Hi Ann		250 Accepted	1.7 s	$0.001
merge	(row with "bad-address")		skipped: no valid email		free
merge, dry run	Hi Raj, your Team report is ready		rendered, not sent		free

real runs on Apify, 24 Sep 2026, recipients redacted

Why buyers pick Letterkeel

1Works with SMTP, Resend, SendGrid, Mailgun and Postmark: send from your own domain.

2Mail merge from any dataset or sheet, with per-recipient status and CSV attachments.

3Dry-run mode previews every message before a single email goes out.

4Failed sends and dry runs free

How it works

Open it on Apify and paste your list (a prefilled example is ready).
Press Start. Results stream into a table in seconds.
Export to CSV, JSON or Excel, call it by API, or schedule it.

Who it's for

Apify users who want results emailed
Automation builders on Make, Zapier and n8n
AI agents that need to send email
Small teams sending mail merges from a sheet or dataset

Get it

Bulk Email Sender: SMTP, Resend, SendGrid [$1/1K 💰]

$0.001 per email sent, failures and dry runs free

Give it your SMTP login or a Resend, SendGrid, Mailgun or Postmark key; it sends alerts, run digests with CSV and mail merges from your own domain, for $0.001 per email.

Get it on Apify

What's inside

💰 $1 per 1,000 emails sent; dry runs, failed sends and invalid addresses free. Send email to anyone from Apify runs, webhooks and AI agents through your own SMTP, Resend, SendGrid, Mailgun or Postmark: mail merge from datasets, CSV result digests, attachments, per-recipient status.

For developers: API, keys and MCP

MCP for AI agents

Pay only for results

Failed or empty results are free. You pay per result on your own Apify account, and Apify's free monthly credit covers a first test. Stop any time; there is no subscription.

Compare

Send email from Apify: Letterkeel vs the alternatives (published prices, a real sample, FAQ)
Compared with feedsmith Send Email (Letterkeel vs feedsmith Send Email: sending email from Apify runs and AI agents)

Works well with

DomainDNA API: check a domain's SPF and DMARC before sending
Noticewright: privacy policy and terms for your sign-up form
Leafmelt: documents to Markdown API

Questions

How do I pay?

You run it on your own Apify account and pay only per result; failed or empty results are free. Apify's free monthly credit covers a first test.

Can AI agents use it?

Yes. It is callable through Apify's MCP server and REST API.

Can I run it on a schedule?

Yes. Apify schedules run it daily or weekly and send the results to Sheets, Zapier, Make, n8n or a webhook.

Why not the free apify/send-mail?

It is free but only delivers to your own Apify account email, so it can't reach customers, teammates or clients. Letterkeel sends to anyone through your own provider and returns the message ID and SMTP response for every email.

Why not call my email provider's API directly?

You can, if you want to write the code. Letterkeel already turns any Actor's dataset into a table email with CSV, does mail merge with invalid and duplicate addresses skipped, retries rate limits, and switches between five providers by changing one field.