Settings — Mail Engine

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Settings

Default values for new campaigns, quotas, timezone, and test email preferences

Backup & Restore

Sending Limits

Daily quota caps per mailbox

Daily limit per mailbox

Gmail free: 500/day · Workspace: 2,000/day.

Test email limit / day

Separate from campaign quota.

Retry on failure

0 = no retries. 1 = one retry.

Reply-To Address

Default reply-to for outgoing campaigns

Default Reply-To address

Leave blank to use each sender's own address. A dedicated reply-to helps track replies and looks more professional.

Delay & Batch Defaults

Default values pre-filled in campaign sending mode

Min delay (seconds)

Shortest gap in Random Delay / Burst modes.

Max delay (seconds)

Wider range = more human-like.

Emails per batch

Per burst cycle.

Pause min (min)

Shortest pause.

Pause max (min)

Longest pause.

Inbox & Timing

Reply behaviour, inbox polling and timezone

Stop follow-ups on reply

Cancel remaining follow-up steps once a lead replies.

Auto-add replies to Pipeline

New inbound replies create a Pipeline card in the first stage.

Inbox poll interval (seconds)

How often to check the Reply-To inbox. Minimum 30 s.

Reply-To account

No Reply-To account connected. Set one on the Senders page.

App timezone

Used for sending time windows and scheduled sends.

Follow-up Delay Presets

Quick-pick buttons shown when adding follow-up steps to a campaign

Add preset

Test Email Defaults

Pre-filled values in the Send Test Email modal

Default recipient email

Pre-filled in the "To" field so you don't retype it each time.

Default subject line

Subject used when no custom subject is entered.

Default template

Override the built-in test template with a custom one.

Email Open Tracking

One-time setup for live open-rate tracking

App Base URL

Public URL where this app is reachable. Required for tracking pixels — without it, open tracking is inactive for all campaigns. Your own app URL works; no separate tracking domain needed.

✓ Tracking active for campaigns with "Track opens" enabled.

How it works

A 1×1 tracking pixel is embedded in each email. When a recipient opens the email, the pixel loads from your app and the open is recorded.

Open tracking requires campaigns to have Track Opens enabled at launch. Pixel is only injected when the App Base URL is set.

Sender → Lead Provider Routing

Match senders to leads by email provider (Gmail→Gmail, Microsoft→Microsoft)

Routing Mode

Off

Smart

Strict

Off: All senders rotate equally across all leads regardless of provider. Default behaviour — no provider matching.

Requirements

Leads must be scanned for provider on the Leads page.
Senders matched by account type: Outlook OAuth = Microsoft, Gmail OAuth = Google, SMTP = inferred from host.
Smart mode fills in from the full pool when no matching sender is available — safest choice.
Strict mode skips leads with no matching sender — use only when you have senders for every provider type.

AI Subject Line Style

Controls how Oya writes subjects when generating email variations

Subject Style

Changes apply immediately to new campaigns

Domain & SSL

Point your domain to this VPS then install a free SSL certificate

HTTPS ACTIVE

Live App URL

https://smartsendplus.online

OAuth Redirect URI — add to Google Cloud Console

https://smartsendplus.online/oauth/callback

After SSL is set up, update your Google Cloud Console Authorized Redirect URI to the HTTPS version.