Email to Slack Integration
Forward email to Slack channels and reply directly from threads. Your response goes back as a normal email. Full thread history preserved.
About 5 minutes to set up. 14-day trial, $0 today, then from $15/month per inbox.
📋What you'll need to get started
Gmail, Outlook, or any provider
Permission to add apps
No passwords needed
We never access your inbox
No contracts or commitments
We'll help you get started
How to set it up
Three steps. Takes about 5 minutes total.
Connect Slack
Click "Add to Slack" and choose which channel receives emails. You'll need admin permission in your workspace, or ask an admin to approve.
Set up forwarding
We give you a unique address like inbox-abc@relay.relaymail.app. Set up forwarding in Gmail, Outlook, or any email provider. No passwords needed - we never access your inbox directly.
Start replying
Incoming emails appear in your Slack channel. Reply in the thread and your response is sent as an email. The customer gets a normal email reply.
Happy to help! I've reset your password. Check your email for instructions.
On Dec 8, 2025, john@customer.com:
Hi, I'm having trouble with my account login. Can you help?
How to Forward Email to Slack
Step-by-step guides for Gmail, Outlook, Yahoo, and other email providers. Set up Slack email integration in under 5 minutes.
View Setup Guides →Everything you need. Nothing you don't.
Reply from Slack, send as email
Key featureType your response in Slack. Your customer receives a proper email from support@yourcompany.com. Full thread history is preserved on both sides.
Threads stay connected
Email replies come back to the same Slack thread. Your whole team sees the conversation in one place.
Instant both ways
Emails appear in Slack within seconds. Slack replies send immediately. Real-time, two-way sync.
Any email provider
Gmail, Outlook, Yahoo, or any provider that supports forwarding. No passwords or API access needed.
Pricing
Per inbox. Every plan has every feature and starts with a 14-day trial. Plans differ only by monthly volume.
Starter
- Up to 1,000 threads/month
- Two-way email and Slack
- Reply from a Slack thread
- Replies from your own domain
- Email support
Team
- Up to 3,000 threads/month
- Everything in Starter
- A sender address per teammate
- Control who can reply
- Priority support
Pro
- Up to 10,000 threads/month
- Everything in Team
- Priority support
- $0 today. Cancel in Billing before day 14 and you are never charged.
- No email password or mailbox access. You add a forwarding rule, and deleting it stops all mail to us.
- Email bodies go to your Slack channel and are not stored on our servers.
- Works with Gmail, Outlook, iCloud, Yahoo and mail on your own domain.
RelayMail is not a fit if
- You need a help desk with ticket assignment, SLAs and reports. A tool like Front fits better.
- You only want to read email in Slack. Slack's built-in email forwarding does that at no extra cost.
- You need an API, or one inbox posting to several Slack channels.
- Your team does not work in Slack day to day.
Common questions
How do I forward email to Slack?
Start a trial, connect a Slack channel and you get a unique forwarding address. Add it as a forwarding address in Gmail, Outlook or any provider. New emails then show up in that channel, and a reply in the thread goes back as an email.
Can I reply to the email from Slack?
Yes. Reply in the Slack thread under the email. RelayMail sends your reply to the sender as an email in the same conversation, and their next answer lands in the same Slack thread.
How do I connect Gmail to Slack?
1) Start a trial and connect your Slack channel. 2) In Gmail settings, under Forwarding, add your RelayMail address. 3) Gmail's confirmation email shows up in Slack; click the link in it. New mail now flows to Slack.
Can several teammates reply from Slack?
Yes. Anyone in the channel can reply by default. You can limit replies to admins or to specific people, and each teammate can send from their own address once your domain is verified.
What address do customers see on my replies?
By default the reply shows your name, is sent from RelayMail's relay address and uses your own address as Reply-To, so the customer's answer comes back to you. Verify your domain with a few DNS records and replies go out from your own address, such as support@yourcompany.com.
How is this different from Slack's built-in email forwarding?
Slack's own email forwarding is one-way: email comes into Slack, and you still answer from your mail app. RelayMail adds the way back: you reply in the Slack thread and the customer gets an email. If you only need to read email in Slack, Slack's built-in option is enough and costs nothing extra.
Which email providers work?
Any provider that can forward mail: Gmail, Google Workspace, Outlook and Microsoft 365, Yahoo, iCloud, Fastmail, and mail on your own domain. No passwords or API access are needed, only a forwarding rule.
Do you store my emails or passwords?
We never ask for or store email passwords. Emails pass through RelayMail on their way to Slack. We keep the thread mapping (which Slack thread belongs to which email conversation) so replies reach the right person.
How does the 14-day trial work?
Every plan starts with a 14-day trial. You add a card at checkout and pay $0 today. Cancel from Billing in your dashboard before day 14 and you are never charged. After the trial it is $15, $39 or $149 per inbox per month.
How we compare to alternatives
Two tools that put customer email in Slack, and the shared-inbox app many teams compare first. If you want ticket assignment and reporting, Front is the better pick.
Prices from public pricing pages and ClearFeed's comparison of Slack inbox tools (May 2026). Check each vendor for current terms.
Detailed comparisons: Slack email forwarding, Front, SharedInbox
Handle email from Slack.
Reply to customers without ever leaving your workspace. Two-way sync keeps everything connected.