Skip to main content
Campaigns can send an email next to their LinkedIn steps: a short, personal note from your own inbox, never a bulk send. You connect Gmail, Outlook or any other inbox (IMAP) once, then add a Send email step on the canvas (see Write and send emails: plain text, rich text with pictures and GIFs, or HTML).
Pro plan. Email is part of Pro and Agency. Each inbox is a paid add-on (US$7 a month), not part of the free trial: first add inboxes in Settings > Billing, under Add-ons, then connect them here. On Starter, Email inboxes shows that email is part of Pro. Inboxes you already connected keep working. See Add-ons.

​
Connect an inbox

1

Open Connect accounts

In the menu on the left, click Connect accounts and scroll down to Email inboxes.
2

Connect

Click Connect an inbox, then Continue with Google, Continue with Microsoft or Other inbox. You sign in on Google’s or Microsoft’s own page and allow access; your password stays with them.
3

Done

You come back to Kerux and the inbox shows as Connected.
On the Google or Microsoft page you may see the name of Kerux’s secure email partner asking for access. That is normal: it is the service Kerux uses to connect inboxes, and your password is never shared with Kerux.

​
Gmail with an app password (instead of signing in)

If you would rather not sign in with Google, you can connect Gmail with an app password: a 16-letter password Google makes for one app, which you can remove at any time without changing your Google password. Click Connect an inbox, then Connect Gmail with an app password, and:
  1. In your Google account, turn on 2-Step Verification (if it isn’t on yet).
  2. Open Google app passwords, type Kerux as the name and click Create.
  3. Copy the 16 letters Google shows. Enter your Gmail address, paste the app password and click Connect inbox.
Kerux uses the app password once to connect the inbox and never stores it. If you don’t see App passwords in your Google account, 2-Step Verification is off, or your Google Workspace admin turned app passwords off (ask them). A Gmail inbox connected this way sends and receives email only; to use its calendar, connect it in Meetings > Connected calendars.

​
Connect its calendar

Each inbox is a row with how many emails it sent today and its calendar (Calendar on, Calendar off or Calendar needs permission). Click Manage on an Outlook inbox (or a Gmail inbox connected before November 2026), then Connect calendar, and Kerux knows when a contact books a meeting with you, so your campaigns can stop writing to them. Same connection, no extra cost. See Meetings booked by contacts.

​
How emails are sent

  • From the inbox itself, so they look like any email you write.
  • A few a day: each inbox has a daily limit (40 by default, change it next to the inbox), with a few minutes between two emails.
  • Only inside the campaign’s hours (Monday to Friday, 9:00 to 18:00 unless you changed them in the campaign’s settings).
  • With one short line on how to stop the emails and your postal address at the end. Add your postal address in Settings > Sending rules before your first email campaign: without it, campaign emails wait. See Write and send emails.
  • Never with a hole: an empty name or company uses your default (for example “there” for a first name), and any other empty variable stops the contact, which shows what is missing. See Variables.
  • If Kerux can’t confirm an email went out (for example, the inbox didn’t answer in time), it is never sent again on its own: it waits in Home > Tasks (under Unconfirmed sends) for you to check the inbox’s Sent folder and decide.

​
Opens and clicks

Kerux tracks who opens your campaign emails and clicks their links, so a campaign can follow up only with the people who engaged (If they react step) or start another one (Email opened, Email link clicked). It’s on by default for each campaign; turn it off in the campaign’s Settings with Track email opens and clicks. Opens are an estimate: some mail apps hide them, and others open emails on their own. See Email opens and clicks for what you see, how to use it, and privacy.

​
Which inbox sends

In the Send email step you can pick the inbox. Left on automatic, the email goes from the inbox of the person whose LinkedIn account runs that contact, or from the first connected inbox.

​
Replies

When a contact answers your email, the reply shows in their timeline and stops the campaign for them, like a LinkedIn reply (unless you turned “stop on reply” off in the campaign’s settings). It counts whether they write from their email or from any other address Kerux knows for them.

​
Every email on the contact page

Emails you send by hand from the connected inbox (outside Kerux) to a contact show on the contact’s history too, as Email sent, with the subject and the start of the text. They never count as a reply and never move a campaign. Campaign emails already show there, so they aren’t added twice (an email with the same subject as a campaign email, within 30 minutes of it, counts as that campaign email; another subject is always added), and emails with people who aren’t contacts in your workspace aren’t stored. Replies from contacts, and the emails you send them, also show in the inbox, where you can answer them from the same inbox.

​
Common problems

The Email inboxes section shows why instead. In the free trial, click Choose a plan first. On a paid plan, you have no paid inbox left to connect (you haven’t added one yet, or every inbox you pay for is already connected): click Add an inbox, add one more in Add-ons, then come back and connect it. See Add-ons.
Your organization has more inboxes connected than it pays for (for example, you cancelled an inbox add-on and the period you paid for ended). Kerux disconnects the extra ones, the most recently connected first, and keeps the oldest. To use it again, click Add an inbox, add one in Add-ons, then remove the disconnected inbox and connect it again. See Stop paying for an inbox.