Custom SMTP setup

When to use custom SMTP

Use this option if you're sending from a provider not listed (SendGrid, Postmark, Mailgun, AWS SES, Zoho, Fastmail, or your own mail server).

Required information

You'll need these details from your email provider:

• SMTP Host: The outgoing mail server hostname (e.g., smtp.sendgrid.net)
• Port: Typically 587 (STARTTLS) or 465 (SSL). Prefer 587.
• Security: STARTTLS or SSL/TLS
• Username: Usually your email address or an API key (varies by provider)
• Password: Your account password or SMTP-specific password/API key

Configuring in Revnox

Go to Settings > Email Accounts > Add Account > Custom SMTP:

Enter your SMTP host and port

Select security type (STARTTLS recommended)

Enter username and password

Click Test Connection

If the test passes, you'll see a green checkmark and the account becomes available to assign to campaigns.

Provider-specific notes

SendGrid: Use smtp.sendgrid.net, port 587, username = apikey, password = your SendGrid API key.AWS SES: Use your region-specific SES endpoint (e.g., email-smtp.us-east-1.amazonaws.com), port 587, with SMTP credentials from the SES console (not your AWS root credentials).Postmark: Use smtp.postmarkapp.com, port 587, username and password are both your Postmark Server API Token.

Testing recommendations

After setup, send a test email via Test Connection, then check that it arrived and wasn't flagged as spam. If it lands in spam, review SPF/DKIM configuration for your domain.