Create an SMTP credential
/api/v1/smtp-credentialsA username and password for relaying mail over SMTP, scoped to one domain.
The password is shown once. It is stored only as a hash, so nobody — including Mailyte — can read it back. If it is lost, rotate rather than recreate.
Use SMTP when you have an existing application or library that speaks it. Use
POST /messages when you are writing the
integration yourself: it gives you message ids, tags and per-message delivery events
that SMTP submission cannot.
A marketing key needs Bounce protection on. A key with stream: "marketing" only
sends to your contacts whose address has been checked, and Bounce protection is what
checks new contacts. Where Bounce protection is available and your account has it
turned off, creating a marketing key answers 422 with
error_code: "bounce_protection_required" and data.setting_path, the page where it
is turned on, and nothing is created. A transactional key is never refused for this.
Request body
namestringrequiredA name for your team, like
Website contact form.domain_idstringrequiredThe domain this key sends from. Copy its ID from the domain's page in the dashboard, or read it from
GET /domains.allowed_ipsarray<string>The IP addresses allowed to use this key when
ip_allowlist_enabledis true. Any other address is refused.ip_allowlist_enabledbooleanAccept this key only from
allowed_ips.expires_atstringOptional. When the key stops working, ISO 8601. Leave it out for a key that does not expire.
hourly_limitintegerOptional. The most emails this key may send in an hour.
daily_limitintegerOptional. The most emails this key may send in a day.
tracking_enabledbooleanTrack opens and clicks in mail sent with this key. Defaults to false for an app (transactional) key, so its links stay on your own domain, and true for a marketing key.
streamstringtransactional | marketingtransactionalfor emails your app sends one at a time, like receipts and sign-in codes;marketingfor newsletters and promotions. They go out from different addresses so one cannot harm the other.
Request
/api/v1/smtp-credentialscurl -X POST 'https://app.mailyte.com/api/v1/smtp-credentials' \
-H 'Authorization: Bearer mk_live_YOUR_API_KEY' \
-H 'Content-Type: application/json' \
-d '{
"name": "Website contact form",
"domain_id": "01JBT8XQ2M9WYC3K4F6R7S8T9V"
}'const response = await fetch('https://app.mailyte.com/api/v1/smtp-credentials', {
method: 'POST',
headers: {
Authorization: 'Bearer mk_live_YOUR_API_KEY',
'Content-Type': 'application/json',
},
body: JSON.stringify({
"name": "Website contact form",
"domain_id": "01JBT8XQ2M9WYC3K4F6R7S8T9V"
}),
});
const { data } = await response.json();import requests
response = requests.post(
"https://app.mailyte.com/api/v1/smtp-credentials",
headers={"Authorization": "Bearer mk_live_YOUR_API_KEY"},
json={
"name": "Website contact form",
"domain_id": "01JBT8XQ2M9WYC3K4F6R7S8T9V"
},
)
data = response.json()["data"]<?php
$response = Http::withToken('mk_live_YOUR_API_KEY')
->post('https://app.mailyte.com/api/v1/smtp-credentials', [
'name' => 'Website contact form',
'domain_id' => '01JBT8XQ2M9WYC3K4F6R7S8T9V',
]);
$data = $response->json('data');require "net/http"
require "json"
uri = URI("https://app.mailyte.com/api/v1/smtp-credentials")
request = Net::HTTP::Post.new(uri)
request["Authorization"] = "Bearer mk_live_YOUR_API_KEY"
request["Content-Type"] = "application/json"
request.body = {
"name": "Website contact form",
"domain_id": "01JBT8XQ2M9WYC3K4F6R7S8T9V"
}.to_json
response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(request) }Response
Success.
dataobjectobjectstringsmtp_credentialidstringUnique identifier for the credential.
namestringYour name for the key. It is not used to sign in.
usernamestringThe SMTP username, to set in your mail library. Delivery events name it. Safe to log.
statestringactive | paused | revoked | inactive | expired | suspended | pending_review | provisioning | failed | deletingWhether the key can send. Only
activecan. -deleting,failed: being removed, or setup failed. -pending_review: a marketing key waiting for approval. -expired: pastexpires_at. -suspended: switched off by us or after delivery failures. -inactive: retired after a long time unused (the owner was warned three times). Turning it back on keeps the same username and secret. -paused: on hold because it suddenly sent far more than usual or from a new host. Its mail waits rather than bouncing. The hold lifts by itself (after six hours by default), or now withPOST /smtp-credentials/{credential}/resume.streamstringtransactional | marketingWhich lane mail sent with this credential is treated as. The stream decides reputation handling and marketing gating; it is not a label.
domainobjectThe one domain this key may send as.
idstringThe domain's ID. Always set.
namestringThe domain's name. Some responses leave it null; use
domain.id, or read the key fromGET /smtp-credentials.
ip_allowlistobjectEnforced by the mail server at AUTH time, not by this API.
enabled: falsewith a populated list is a configured allowlist that is currently off, not a contradiction.enabledbooleanaddressesarray<string>IPv4/IPv6 addresses or CIDR ranges.
limitsobjectLimits for this key alone, below your plan's limits.
hourlyintegerRecipients per hour for this key. Null means no key limit is set; your plan's limit still applies.
dailyintegerRecipients per day for this key. Null means no key limit is set; your plan's limit still applies.
tracking_enabledbooleanWhether open and click tracking is injected into HTML sent with this credential.
last_used_atstringWhen this key last signed in to send. It can be up to an hour behind. Null means no use has been seen yet, which is not proof the key is idle. For a live figure, use
GET /smtp-credentials/{credential}/usage.expires_atstringWhen the key stops working, in ISO 8601 UTC. Null means it never expires (the default). Null does not mean expired.
created_atstringISO 8601 UTC.
passwordstringThe SMTP password. **Shown only when the key is created or rotated**, and never again: save it now. If you lose it, rotate the key.
smtpobjectThe SMTP host and port to send with, returned only when the key is created. They are the same for every key, so you can save them once.
hoststringSMTP submission host.
portintegerSMTP submission port.
Returned inside the standard envelope.
Errors
| Status | When |
|---|---|
401 | The API key is missing, unknown, revoked or expired. All four answer identically, on purpose: distinguishing them would confirm which keys exist. |
403 | The key is valid but may not do this: it lacks the required scope, its IP allowlist does not include you, or this endpoint does not accept API keys. |
404 | No such resource in this organization. |
422 | The request was understood but the values were not acceptable. |
429 | Too many requests, or the organization has spent its sending allowance. `Retry-After` says how long to wait. |
Every status, with what causes it and what to do, is on the error reference.