Resend Integration

Mailer uses Resend as the email provider. You can set up your own Resend account for full control over your email sending.

Why Use Your Own Resend Account?

Custom domains - Send from your own verified domain
Better deliverability - Control your own sender reputation
Advanced tracking - Access to Resend's analytics dashboard

Getting Started

1. Create a Resend Account

Go to resend.com and sign up for an account.

2. Get Your API Key

Navigate to API Keys in your Resend dashboard and create a new API key.

Security Tip: Create a key with only "Send emails" permissions.

3. Add Your API Key to Mailer

Go to your Organization Settings
Find the "Email API Key" section
Paste your Resend API key
Click "Save"

Your organization will now use your Resend account for all email sending.

Setting Up Custom Domains

Add Domain to Resend

Go to resend.com/domains
Click "Add Domain"
Enter your domain
Add the DNS records provided by Resend

DNS Records

Resend will provide you with specific DNS records to add. These include:

SPF records
DKIM records
DMARC records (recommended)

Verify Domain

Return to resend.com/domains
Wait for DNS verification (usually 24-48 hours)
Status will change to "Verified" when ready

Use Custom Domain in Mailer

Once verified, your domain will appear in your organization's domain list:

Go to Organization Settings
In the "Active Sending Domain" section
Select your verified domain from the dropdown

All emails from this organization will now be sent from your custom domain.

Custom Send-From Address

With a verified domain, you can send from any address on that domain.

Simply update the "from" field when creating emails in Mailer.

Troubleshooting

Domain Not Verifying

Check DNS records are correctly added
Wait 24-48 hours for propagation
Verify TXT record format is correct

Low Deliverability

Ensure SPF, DKIM, DMARC are all configured
Clean your email lists
Warm up new domains gradually
Monitor and remove hard bounces

API Key Not Working

Verify the key is correctly pasted
Check key has "Send emails" permission
Ensure key hasn't been revoked in Resend dashboard