slackapi/deno-slack-sdk

Slack App installed via CLI in our Enterprise Grid failing to send emails

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#510 opened on Mar 3, 2026

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 (7 comments) (1 reaction) (1 assignee)TypeScript (45 forks)auto 404
help wantedserver-side

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Description

We have an Enterprise Grid plan and need to send emails via SMTP from our hosted CLI Slack app (App ID: A071YDWMBG8) that forwards messages in a channel to our ticketing system.

This solution used to work until recently, when we realised it stopped working with an SMTP error

Current Issue:

Error: "NotCapable: Requires net access to smtp.gmail.com:587." error: Uncaught (in promise) NotCapable: Requires net access to "smtp.gmail.com:587", run again with the --allow-net flag conn = await Deno.connectTls({ outgoingDomains configured in manifest SMTP ports (587, 465) are blocked by the platform Steps taken: We used the --allow-net flag, yet no success

Please help

Contributor guide

Research direction
Investigate the allow net flag and outgoing domains configuration in the Slack manifest to resolve the SMTP connection permission error.
Tech stack
typescriptdeno
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
DenoSlack SDK
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65