Pricing

$1.00 / 1,000 email sents

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Letterkeel — Send Email to Anyone via SMTP, Resend & SendGrid

Try for free

Send email to anyone from Apify runs, webhooks and AI agents, from your own domain. Email sender for SMTP, Resend, SendGrid, Mailgun and Postmark: bulk mail merge from datasets, result digests with CSV, attachments, per-recipient status. $0.001 per email; failures free.

Pricing

$1.00 / 1,000 email sents

Rating

0.0

(0)

Developer

CyberMax

Actor stats

Bookmarked

Total users

Monthly active users

20 days ago

Last modified

Categories

Automation

Integrations

Developer tools

Provider

provider

Optional

How to send: your own SMTP server (Gmail/Google Workspace, Microsoft 365, Amazon SES, Zoho, Fastmail, any host) or the API of Resend, SendGrid, Mailgun or Postmark. Letterkeel never sends through shared servers: mail goes out from your account and your domain.

Type:string

Default:smtp

Options:

smtpresendsendgridmailgunpostmark

From

from

Optional

Sender, e.g. "Acme Alerts alerts@acme.com". Must be an address your SMTP login or provider lets you send from (a verified sender/domain).

Type:string

Optional

Recipient(s), separated by commas: "ann@acme.com, Bob bob@acme.com". In digest mode, who gets the digest. Not used in merge mode (addresses come from each row).

Type:string

Subject

subject

Optional

Subject line. {{field}} placeholders are filled from each row (merge), from "variables", or with {{count}}/{{date}} (digest).

Type:string

HTML body

html

Optional

HTML body with {{field}} placeholders (values are HTML-escaped; use {{{field}}} for raw HTML). In digest mode, put {{{table}}} where the results table goes (leave empty for the default layout). A plain-text part is generated automatically unless you set "text".

Type:string

Plain-text body

text

Optional

Plain-text body (or the only body). Same {{field}} placeholders as HTML.

Type:string

Mode

mode

Optional

auto = "messages" if given, else digest if a dataset/items are given, else one email to "to". single = one email to "to". messages = a list of different emails. merge = one personalised email per dataset row (mail merge). digest = one email containing all rows as a table + CSV (e.g. the results of another Actor run).

Type:string

Default:auto

Options:

autosinglemessagesmergedigest

Dataset ID (rows for merge/digest)

datasetId

Optional

An Apify dataset to read rows from, e.g. another run's defaultDatasetId. In an Apify webhook or integration use {{resource.defaultDatasetId}} to email the results of any Actor run.

Type:string

Rows (inline)

items

Optional

Rows given directly instead of a dataset: a JSON array of objects, e.g. [{"email": "ann@acme.com", "firstName": "Ann"}].

Type:array

Recipient field (merge)

toField

Optional

Row field holding the recipient address. Default: the first of email, emailAddress, contactEmail, emails.0, Email.

Type:string

Recipient name field (merge)

nameField

Optional

Optional row field used as the recipient's display name, e.g. firstName or fullName.

Type:string

Digest columns

digestFields

Optional

Which fields to show in the digest table (dotted paths allowed, e.g. company.name). Default: the first 6 simple fields. The attached CSV always has every field.

Type:array

Digest heading

digestTitle

Optional

Heading above the digest table. Default "12 rows" ("12 new rows" in monitor mode); placeholders {{count}}, {{total}}, {{date}}.

Type:string

Max rows shown in the digest table

maxDigestRows

Optional

Rows beyond this go only into the attached CSV.

Type:integer

Minimum:1

Maximum:1000

Default:200

Attach the rows as CSV (digest)

attachCsv

Optional

Adds results-YYYY-MM-DD.csv with every row and field.

Type:boolean

Default:true

Don't send an empty digest

skipIfEmpty

Optional

When there are no rows, send nothing (free).

Type:boolean

Default:true

Max rows read from the dataset

maxItems

Optional

Upper limit on rows read from the dataset.

Type:integer

Minimum:1

Maximum:50000

Default:5000

Monitor mode: only rows not emailed before

onlyNew

Optional

Remembers what earlier runs with the same monitor name already emailed. Digest: the email contains only new rows (nothing is sent when there are none). Merge: each address (or idField) gets the email once. Put it on an Apify Schedule for daily "what's new" emails.

Type:boolean

Default:false

Monitor name

monitorName

Optional

Keeps separate memories for different schedules, e.g. "new-leads" and "price-drops".

Type:string

Default:default

Row ID field

idField

Optional

Field that identifies a row across runs (e.g. url or id). Default: digest compares whole rows; merge compares the recipient address.

Type:string

Messages (list of different emails)

messages

Optional

Send several different emails in one run: [{"to": "a@x.com", "subject": "...", "html": "...", "text": "...", "cc": "...", "bcc": "...", "replyTo": "...", "attachments": [{"filename": "a.txt", "text": "..."}]}]. Messages with problems are skipped for free and reported.

Type:array

Variables

variables

Optional

Extra values for {{placeholders}} in every email, e.g. {"product": "Acme"}.

Type:object

Send separately to each "to" address

sendSeparately

Optional

One email per address instead of one email with everyone in To (recipients don't see each other).

Type:boolean

Default:false

Optional

Comma-separated addresses.

Type:string

Bcc

bcc

Optional

Comma-separated addresses (in merge mode added to every email, e.g. a CRM dropbox).

Type:string

Reply-To

replyTo

Optional

Where replies go, if not the From address.

Type:string

Attachments

attachments

Optional

Files added to every email: {"filename": "report.pdf", "url": "https://..."}, {"key": "OUTPUT", "filename": "report.pdf"} (a record from the key-value store set below, e.g. a PDF or screenshot made by another Actor), {"filename": "a.txt", "text": "..."} or {"filename": "a.png", "contentBase64": "..."}. 20 MB total.

Type:array

Key-value store for attachments

keyValueStoreId

Optional

An Apify key-value store to read attachment records from (e.g. another run's defaultKeyValueStoreId holding a PDF, screenshot or report). Attachments given as {"key": "OUTPUT", "filename": "report.pdf"} are read from here.

Type:string

Extra headers

headers

Optional

Custom headers, e.g. {"X-Campaign": "q3"}.

Type:object

Unsubscribe URL

unsubscribeUrl

Optional

Adds List-Unsubscribe (and one-click List-Unsubscribe-Post for https URLs) so Gmail/Yahoo show an unsubscribe button. Placeholders allowed: https://acme.com/unsub?e={{email}}.

Type:string

SMTP host

smtpHost

Optional

e.g. smtp.gmail.com, smtp.office365.com, email-smtp.us-east-1.amazonaws.com, smtp.zoho.com, smtp.resend.com, smtp.sendgrid.net.

Type:string

SMTP port

smtpPort

Optional

587 (STARTTLS, default) or 465 (TLS). Port 25 is usually blocked in the cloud.

Type:integer

Default:587

Use TLS from the start

smtpSecure

Optional

Default: on for port 465, off (STARTTLS) otherwise.

Type:boolean

SMTP username

smtpUser

Optional

Usually your full email address.

Type:string

SMTP password

smtpPassword

Optional

Stored encrypted by Apify (secret input). Gmail/Google Workspace and Outlook need an app password, not your normal password.

Type:string

Allow self-signed TLS certificates

smtpAllowSelfSigned

Optional

Only for your own mail server with a self-signed certificate.

Type:boolean

Default:false

API key (Resend, SendGrid, Mailgun, Postmark)

apiKey

Optional

Your provider API key (Postmark: server token). Stored encrypted by Apify (secret input).

Type:string

Mailgun sending domain

mailgunDomain

Optional

e.g. mg.acme.com (Mailgun only).

Type:string

Region (Mailgun/SendGrid)

region

Optional

eu for Mailgun EU domains or SendGrid EU subusers.

Type:string

Default:us

Options:

useu

Postmark message stream

postmarkStream

Optional

Default outbound (transactional).

Type:string

Dry run (preview, send nothing, free)

dryRun

Optional

Renders every email (recipients, subject, text and HTML) into the dataset without sending or charging. No credentials needed. Turn it off to send.

Type:boolean

Default:false

Max emails per run

maxEmails

Optional

Safety cap on emails sent in one run.

Type:integer

Minimum:1

Maximum:5000

Default:100

Parallel sends

maxConcurrency

Optional

How many emails are sent at the same time.

Type:integer

Minimum:1

Maximum:10

Default:3

Pause between emails (ms)

delayBetweenEmailsMs

Optional

Per parallel sender; use it to stay under your provider's rate limit (e.g. Gmail).

Type:integer

Minimum:0

Maximum:60000

Default:0

Generate a plain-text part from HTML

autoText

Optional

Adds a plain-text version of HTML emails (better deliverability).

Type:boolean

Default:true

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apify/send-mail

Send a custom email to one or more recipients. This Actor is useful for notifications and reporting. It can be invoked directly from code or via webhook integration after another Actor finishes.

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