We are using Slack as a team. However, there are also parties that are not part of our team but can participate via a mailing list.

I want to set up a channel in Slack, say #mailinglist. Whenever some team member posts a message into this channel I want an email going out to the mailinglist address.

  • There doesn't seem to be an outgoing email integration for now Commented Aug 20, 2015 at 8:33
  • @Sathya Yes. That's the definition of integration though. I thought maybe something could be accomplished using the outgoing webhook. One could hook it up with a mail-sending PHP script.
    – koloman
    Commented Aug 20, 2015 at 8:49

3 Answers 3


I solved this by using Slack's WebHook integration and let it call a little PHP script I wrote. The script takes the information and mails it.

The script is really simple and it's on GitHub.

  • How did you configure the webhook? Is it a slack command that you run like /mail This is the email body or can the mail script be triggered automatically by a keyword in a post?
    – Philipp
    Commented Jul 3, 2017 at 11:46
  • 2
    Thanks for the suggestion of Slack's webhook integration and for the example. They worked perfectly for my requirements. Note that you will need to install it once PER-CHANNEL if you do not use keywords to trigger on "any channel". There is no "any channel" selection that will send an e-mail without a keyword (why not is beyond me...) I did try MailClark first but found it difficult to configure, confusing, and only free for one channel and then $9/month after that for each extra channel. Way beyond my budget anyway.
    – OttToyBoy
    Commented Aug 28, 2017 at 19:15

There's a Slack integration for that: MailClark. It includes a Group mode, which does exactly what you describe. You can have a Slack channel with any combination of Slack and email users, where Slack messages are sent out as emails, and emails are received as Slack messages.

  • 1
    support will end with end of 2022 mailclark.ai/help/article/9w4m1i908x Commented Nov 21, 2022 at 9:51
  • @CodingYourLife indeed. Any alternatives to suggest?
    – Savageman
    Commented Nov 25, 2022 at 16:08
  • yes posted my recommendation. in case since 2016 you are now about to migrate check my answer ;) Commented Nov 25, 2022 at 20:23

This was asked quite some time ago and I think the answers are not accurate anymore. MailClark will put the plug end of 2022 and not sure if the php example is still working.

But I ended checking what's the latest desire for slack how to tackle such a problem and I guess it is a Slack Bolt App: https://api.slack.com/bolt

I can recommend it.

It is surprisingly easy to do a simple text matching that can e.g. reverse your text. So "hello" becomes ""olleh".

E.g. here in Javascript.

// Reverse all messages the app can hear
app.message(async ({ message, say }) => {
  // Filter out message events with subtypes (see https://api.slack.com/events/message)
  if (message.subtype === undefined || message.subtype === 'bot_message') {
    const reversedText = [...message.text].reverse().join("");
    await say(reversedText);

I guess from there it is easy to instead send the text as email (check sendgrid, mailgun, amazon SES) or start a Falcon 9 Rocket.

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