Send Your WiFi E-mails Through SendGrid

Summary Send your hotspot’s guest e-mails — the status-page link and the “how to pay” instructions — from your own SendGrid account. SendGrid is added as an e-mail Channel and delivers over its HTTP API (great for higher volumes). You need a verified sender and an API key with Mail Send permission.

Field in MKController	What it is	Example
E-mail	The from-address, verified in SendGrid	noreply@yourbrand.com
Sender name	The name guests see as the sender	YourBrand Wi-Fi
Api Key	A SendGrid API key with Mail Send scope	SG.xxxx…

SendGrid only sends from an address (or domain) you’ve proven you own.

1. Sign in at app.sendgrid.com.
2. Open Settings → Sender Authentication.
3. Either Verify a Single Sender (quickest — confirm one from-address by e-mail) or Authenticate Your Domain (best deliverability — add the DNS records SendGrid gives you).

1. Open Settings → API Keys → Create API Key.
2. Name it (e.g. MKController) and choose Restricted Access with Mail Send turned on (or Full Access).
3. Click Create and copy the key (it starts with SG.) — it is shown only once.

1. Open Integrations → Channels.
2. Click Add channel → choose E-mail → Continue.
3. Choose the SendGrid provider → Continue.
4. Fill in E-mail (the verified sender), Sender name and Api Key (use the 👁 to reveal it).
5. Click Continue.

1. Enter a recipient e-mail → Send test. MKController sends a real message through your SendGrid account.
2. Check that inbox, then:
   • I got the test — saves the channel as verified.
   • Just save — saves it without confirming the test (pending).

1. Open the voucher → Integrations tab.
2. In the Channels panel, switch on the SendGrid channel.
3. That voucher’s guest e-mails are now sent through SendGrid. Multiple active channels each get a copy.

No active channel = no e-mail. A voucher only sends while at least one channel is active. The E-mail da MKController system channel is on by default.

• HTTP 401 / “unauthorized”. The API key is wrong or was revoked — create a new one and reconnect. Make sure it has Mail Send permission.
• HTTP 403 / “from address does not match a verified Sender Identity”. The E-mail you entered isn’t verified in SendGrid — verify that exact address (or authenticate its domain).
• Test arrives in spam. Prefer domain authentication over single-sender verification for better deliverability.
• Rotate a key? Create a new API key in SendGrid (revoking the old one), then click Reconnect on the SendGrid channel and paste the new value.

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Explore next: Send Your WiFi E-mails Through Gmail · Configure Payment Gateways

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