Set Up Your Sending

Why SMTP?

SentinMail sends emails through your own SMTP server. This gives you full control over deliverability, sender reputation, and cost. You can use any email provider — Gmail, Amazon SES, SendGrid, Mailgun, Postmark, or your own mail server.

Info

Unlike platforms that send from shared servers, SentinMail lets you bring your own infrastructure. Your reputation is yours alone.

Add Your SMTP Configuration

Open SMTP settings

Navigate to Infrastructure → SMTP Configs in the sidebar and click Create SMTP Config.

Fill in your credentials

Enter your SMTP server details:

Field	Description	Example
Name	A friendly label for this config	"Primary Gmail"
Host	Your SMTP server hostname	`smtp.gmail.com`
Port	SMTP port	`587` (TLS) or `465` (SSL)
Username	Your SMTP username	`you@gmail.com`
Password	Your SMTP password or app-specific password	`xxxx xxxx xxxx xxxx`
TLS	Enable TLS encryption (port 587)	On
SSL	Enable SSL encryption (port 465)	Off
Sender Name	The "From" display name	"Acme Corp"
Sender Email	The "From" email address	`hello@acme.com`
Reply-To Email	Where replies go (optional)	`support@acme.com`
Max Emails/Hour	Hourly sending limit	`100`
Max Emails/Day	Daily sending limit	`1000`

Save and test

Click Save. You can test the connection by using it to send a test campaign to yourself.

Use App Passwords

Never use your regular email password. Most providers require an app-specific password or API key for SMTP access. Check your provider's documentation.

Common SMTP Providers

Rate Limits

The Max Emails/Hour and Max Emails/Day fields protect you from accidentally overwhelming your SMTP provider. SentinMail will pause sending and automatically resume when the limit resets.

Tip

Set these limits to match your SMTP provider's limits. If you're unsure, start conservative (100/hour, 1000/day) and increase as needed.

Multiple SMTP Configurations

You can add multiple SMTP configs to a single company. This is useful for:

Different sender addresses — marketing emails from news@acme.com, transactional from no-reply@acme.com
Failover — if one provider goes down, switch to another
Separating traffic — use different providers for different types of emails

When sending a campaign, you choose which SMTP config to use.

Documentation