---
title: "Schedule your emails in advance with scheduled emails"
description: "Schedule your emails and let Lettermint send them when it suits you. Line up a campaign for Black Friday or send a follow-up three days after signup."
url: "https://lettermint.co/changelog/schedule-your-emails-with-scheduled-emails"
published: "2026-09-16"
last_updated: "2026-09-16"
---

# Schedule your emails in advance with scheduled emails

> Schedule your emails and let Lettermint send them when it suits you. Line up a campaign for Black Friday or send a follow-up three days after signup.

Until now, Lettermint sent every email the moment we received it.
Anything that had to go out later was your problem to solve. A cron
job that picks up pending emails, a delayed queue, or a calendar
reminder so the campaign goes out on time.

Now you can schedule an email by passing a date and time along with
it. We hold on to the email and send it when that moment arrives. If
plans change, you can reschedule or cancel it right up until it goes
out.

## Scheduled emails

With [broadcast emails](https://lettermint.co/features/broadcast-emails)
you can line up a newsletter or campaign well ahead of time. Your
weekly update lands every Tuesday at 10:00, even if you finished it
on Monday. And a
[Black Friday](https://lettermint.co/knowledge-base/deliverability/prevent-emails-spam-holidays-gmail-outlook)
campaign no longer means sitting at your laptop at midnight.

For [transactional email](https://lettermint.co/features/transactional-emails)
you schedule the moment you have the information. Someone signs up,
so you queue the follow-up for three days later in the same request.
Someone books an appointment, so the reminder for the day before is
already set. If they cancel, you pull the reminder.

You pass the time when you send the email. That can be
[ISO 8601](https://www.iso.org/iso-8601-date-and-time-format.html),
in UTC or with an offset, or plain English like "tomorrow at 9am",
"in 2 hours" or "Friday at 3pm ET". You can schedule anywhere from
30 seconds to 30 days ahead.

![Scheduled emails in Lettermint](https://lettermint.co/content/changelog/lettermint-scheduled-emails.webp)

## How it works

Scheduling works through the API and SMTP, and our
[SDKs](https://lettermint.co/integrations) support it out of the box.
In a batch, each email can have its own send time, which comes in
handy when one list covers recipients across several timezones.
Here's what it looks like through the API.

```bashsimple
curl -X POST "https://api.lettermint.co/v1/send" \
  -H "x-lettermint-token: lm_project_token" \
  -H "Content-Type: application/json" \
  -d '{
    "from": "hello@acme.com",
    "to": ["recipient@example.com"],
    "subject": "Appointment reminder",
    "html": "<p>Your appointment starts tomorrow at 10:00.</p>",
    "scheduled_at": "2026-09-17T09:00:00+02:00"
  }'
```

Over SMTP, add the `X-LM-Scheduled-At` header to your email. We
strip it before the email reaches the recipient.

```textsimple
X-LM-Scheduled-At: 2026-09-17T09:00:00+02:00
```

### Reschedule or cancel a scheduled email

A scheduled email shows up in your dashboard with the status
**Scheduled** and the date and time it will be sent. You can
reschedule or cancel it from there, or through the API using the
message ID. You get that ID back when you send the email, and you
can also find it in your dashboard or through the Team API.

## Available on Growth and Pro

Scheduled emails is included in the [Growth and Pro](https://lettermint.co/pricing)
plans. The full details, including supported time formats and the
batch endpoint, are in the
[documentation](https://lettermint.co/docs/platform/emails/scheduling).