Keep vendor onboarding correspondence on track
When a vendor is ready to work with you, a clear mailed confirmation can close the loop.
Trigger
Channel Message Received
Triggered when a message is posted in a Slack channel (public, private, or multi-party IM). Does NOT match direct messages.
Action
Send Letter
Tool to send a letter via u.s. mail with specified recipient, sender, and pdf. use after confirming recipient and document details. example: send letter(to name='john doe', to address='123 main st, ...', file url='https://...')
Why this helps
Vendor setup often spans multiple people and tools, making one final confirmation easy to overlook.
- Connect an onboarding milestone with formal correspondence.
- Reduce handoffs for a routine vendor follow-up.
- Confirm the contact and final letter before mailing.
Setup
Build it in a few focused steps.
- 1Connect Slack and Docupost to Notis once through the portal.
- 2Create the automation in the portal or ask Notis conversationally.
- 3Write one instruction asking Notis to prepare a confirmation letter for a completed vendor onboarding update and confirm contact and document details.
- 4Choose Slack Channel Message Received, select a channel for run reports, and test with one real onboarding update.
Questions about this workflow
Can I use a private Slack channel?
Channel Message Received supports messages in public, private, or multi-party IM channels, but not direct messages.
What should the letter contain?
Describe the intended confirmation in your instruction and ensure the correct final PDF and recipient details are available.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Slack to Docupost. A trigger fires from one place; an action lands in another.
Slack triggers
Docupost actions
Recurring trigger
Notis starts this workflow on a schedule, such as daily, weekly, or during business hours.
Send Letter
Tool to send a letter via u.s. mail with specified recipient, sender, and pdf. use after confirming recipient and document details. example: send letter(to name='john doe', to address='123 main st, ...', file url='https://...')
Webhook trigger
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Send Postcard
Tool to send a postcard via u.s. mail with specified recipient, sender, and front/back images. use after confirming recipient addresses and design urls. example: send postcard(to name='john doe', ..., front image='https://...', back image='https://...')
New Channel Created Trigger
Triggered when a new channel is created in Slack.
Channel Message Received
Triggered when a message is posted in a Slack channel (public, private, or multi-party IM). Does NOT match direct messages.
Direct Message Received
Triggered when a new direct message (DM) is sent to a user in Slack. Catches all DMs across all DM channels.
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Message Reaction Removed
Triggered when a reaction is removed from a message in Slack. Supports optional filtering by channel and emoji name.
Reaction Added Trigger
DEPRECATED: use `SLACK_MESSAGE_REACTION_ADDED` instead. Triggered when a reaction is added to a message in Slack.
Connect any two apps with Notis in the middle.
Slack and Docupost, or any other combination from 1,000+ integrations.
When this happens · Trigger
Do this · Action
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