Looking up MTA-STS DNS record, fetching policy file, and checking TLS-RPT...
Looking up MTA-STS DNS record, fetching policy file, and checking TLS-RPT...
MTA-STS + TLS-RPT for
Checked 5/14/2026, 10:52:43 PM · 64ms
No MTA-STS at all. Mail in transit is not enforced.
looked up: _mta-sts.slack.com
Or share this URL with the team that owns the records.
https://mta-sts.slack.com/.well-known/mta-sts.txt
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window.TSMark('start_load');
window.TSMeasureAndBeacon = function (measure_label, start_mark_label) {
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}
performance.mark(start_mark_label + '_end');
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window.TSBeacon(measure_label, performance.getEntriesByName(measure_label)[0].duration);
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window.TSBeacon = function (label, value) {
var endpoint_url = window.ts_endpoint_url || 'https://slack.com/beacon/timing';
navigator.sendBeacon(
endpoint_url + '?data=' + encodeURIComponent(label + ':' + value),
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var endpoint_url = window.ts_endpoint_url || 'https://slack.com/beacon/timing';
new Image().src = endpoint_url + '?data=' + encodeURIComponent(label + ':' + value);
};
}
})();
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window.document.write(
'\u003Cstyle>body * {display:none !important;}\u003C/style>\u003Ca href="#" onclick=' +
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(function() {
var timer;
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try {
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var clientEl = document.getElementById('client-ui');
var sectionEls = document.querySelectorAll('nav, header, section');
pageEl.parentNode.removeChild(pageEl);
clientEl.parentNode.removeChild(clientEl);
for (var i = 0; i < sectionEls.length; i++) {
sectionEls[i].parentNode.removeChild(sectionEls[i]);
}
window.TS = null;
window.TD = null;
window.clearInterval(timer);
} catch (e) {}
}
}, 200);
}
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GA.boot_data.environment = "prod";
GA.boot_data.abs_root_url = "https:\/\/slack.com\/";
GA.boot_data.document_referrer = "";
GA.boot_data.anonymous_visitor = false;
GA.boot_data.beacon_timing_url = "https:\/\/slack.com\/beacon\/timing";
GA.boot_data.referral_code = "";
GA.boot_data.auth_cookie_domain = ".slack.com";
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GA.boot_data.intl_prefix = "";
GA.boot_data.request_uri = "\/.well-known\/mta-sts.txt";
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GA.boot_data.is_spain = false;
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GA.boot_data.is_japan = false;
GA.boot_data.is_europe = false;
GA.boot_data.is_latam = false;
GA.boot_data.is_brazil = false;
GA.boot_data.is_india = false;
GA.boot_data.is_uk = false;
GA.boot_data.is_english = true;
GA.boot_data.is_spanish = false;
GA.boot_data.is_german = false;
GA.boot_data.is_french = false;
GA.boot_data.is_japanese = false;
GA.boot_data.is_portuguese = false;
GA.boot_data.job_board_token = "slack";
GA.boot_data.zd_locale = "en-us";
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function gtag(){window.dataLayer.push(arguments);}
function loadGTM() {
window.dataLayer.push({
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mi: date.getMinutes(),
s: date.getSeconds(),
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//str+= ' ('+diff+'ms)';
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var team = m ? m[1] : null;
m = code.match(/"message":"([0-9]+\.[0-9]+)"/);
var message = m ? m[1] : null;
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request.cmd = 'channel';
TSSSB.handleDeepLinkWithArgs(JSON.stringify(request));
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origRendererEvalAsync(blob);
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You can go back, or try looking on our <a href="http://get.slack.help/hc/en-us" target="_blank">Help Center</a> if you need a hand.</p></div><noscript><style>#loader {
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var alt_src = 'data:image/png;base64,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';
if (logo) {
logo = logo.getElementsByTagName('img')[0];
if (!logo) return;
logo.src = alt_src;
}
}());
</script></div><div id="overlay"></div></div><footer data-qa="footer"><section class="links"><div class="grid"><div class="col span_1_of_4 nav_col"><ul><li class="cat_1">Using Slack</li><li><a href="https://slack.com/is" data-qa="product_footer" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_product">Product</a></li><li><a href="https://slack.com/enterprise" data-qa="enterprise_footer" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_enterprise">Enterprise</a></li><li><a href="https://slack.com/pricing?ui_step=28&ui_element=5" data-qa="pricing_footer" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_pricing">Pricing</a></li><li><a href="https://get.slack.help/hc/en-us" data-qa="support_footer" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_support">Support</a></li><li><a href="https://slack.com/guides" data-qa="getting_started" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_getting_started">Slack Guides</a></li><li><a href="https://slack.com/marketplace" data-qa="app_directory" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_app_directory">Slack Marketplace</a></li><li><a href="https://api.slack.com/" data-qa="api" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_api">API</a></li></ul></div><div class="col span_1_of_4 nav_col"><ul><li class="cat_2">Slack <ts-icon class="ts_icon_heart"></ts-icon></li><li><a href="https://slack.com/careers" data-qa="jobs" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_jobs">Jobs</a></li><li><a href="https://slack.com/customers" data-qa="customers" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_customers">Customers</a></li><li><a href="https://slack.com/developers" data-qa="developers" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_developers">Developers</a></li><li><a href="https://slack.com/events" data-qa="events" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_events">Events</a></li><li><a href="https://slackhq.com/" data-qa="blog_footer" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_blog">Blog</a></li></ul></div><div class="col span_1_of_4 nav_col"><ul><li class="cat_3">Legal</li><li><a href="https://slack.com/privacy-policy" data-qa="privacy" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_privacy">Privacy</a></li><li><a href="https://slack.com/trust/security" data-qa="security" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_security">Security</a></li><li><a href="https://slack.com/terms-of-service" data-qa="tos" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_tos">Terms of Service</a></li><li><a href="https://slack.com/legal" data-qa="policies" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_policies">Policies</a></li></ul></div><div class="col span_1_of_4 nav_col"><ul><li class="cat_4">Handy Links</li><li><a href="https://slack.com/downloads" data-qa="downloads" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_downloads">Download desktop app</a></li><li><a href="https://slack.com/downloads" data-qa="downloads_mobile" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_downloads_mobile">Download mobile app</a></li><li><a href="https://slack.com/brand-guidelines" data-qa="brand_guidelines" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_brand_guidelines">Brand Guidelines</a></li><li><a href="https://slackatwork.com" data-qa="slack_at_work" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_slack_at_work">Slack at Work</a></li><li><a href="https://slack-status.com" data-qa="status" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_status">Status</a></li></ul></div></div></section><div class="footnote"><section><a href="https://slack.com" aria-label="Slack homepage" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_slack_icon"><ts-icon class="c-icon--slack" aria-hidden></ts-icon></a><ul><li><a href="https://slack.com/help/requests/new" data-qa="contact_us" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_contact_us">Contact Us</a></li><li><a href="https://twitter.com/SlackHQ" data-qa="slack_twitter" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_slack_twitter" aria-label="Slack on Twitter"><ts-icon class="ts_icon_twitter" aria-hidden></ts-icon></a></li><li class="yt"><a href="https://www.youtube.com/channel/UCY3YECgeBcLCzIrFLP4gblw" data-qa="slack_youtube" data-clog-event="WEBSITE_CLICK" data-clog-params="click_target=footer_slack_youtube" aria-label="Slack on YouTube"><ts-icon class="ts_icon_youtube" aria-hidden></ts-icon></a></li></ul></section></div></footer><script type="text/javascript">
/**
* A placeholder function that the build script uses to
* replace file paths with their CDN versions.
*
* @param {String} file_path - File path
* @returns {String}
*/
function vvv(file_path) {
var vvv_warning = 'You cannot use vvv on dynamic values. Please make sure you only pass in static file paths.'; if (window.TS && window.TS.warn) { window.TS.warn(vvv_warning); } else { console.warn(vvv_warning); }
return file_path;
}
var cdn_url = "https:\/\/a.slack-edge.com";
var vvv_abs_url = "https:\/\/slack.com\/";
var inc_js_setup_data = {
emoji_sheets: {
apple: 'https://a.slack-edge.com/80588/img/emoji_2017_12_06/sheet_apple_64_indexed_256.png',
google: 'https://a.slack-edge.com/80588/img/emoji_2017_12_06/sheet_google_64_indexed_256.png',
},
};
</script><script type="text/javascript"> // common boot_data
var boot_data = 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<div data-automount-component="ModalContainer"></div></body></html>No TLS-RPT record found. Without it, you do not learn when receivers fail to enforce STS against your domain.
for slack.com
The id is an opaque string. Bump it whenever you change the policy file, otherwise receivers will keep using the cached version.
_mta-stsv=STSv1; id=20260514225243TLS-RPT lets receivers send you JSON reports when STS / DANE fails. Point the rua at a mailbox you actually monitor.
_smtp._tlsv=TLSRPTv1; rua=mailto:[email protected]Host the file below at https://mta-sts.slack.com/.well-known/mta-sts.txt with a trusted TLS cert (no self-signed). Replace the mx: line(s) with each of your real mail servers. Start with mode: testing to collect TLS-RPT failure reports before raising to mode: enforce.
version: STSv1 mode: testing mx: mail.slack.com max_age: 86400
Cloudflare Workers, Pages, or any static host with HTTPS can serve this. The well-known path needs a Content-Type of text/plain.
AI-assisted remediation
Wiredepth Pro sends this report to our AI engine and streams back a 30-day rollout plan tailored to slack.com, with provider-specific tips when we can infer them from the data. 10 playbooks per month on Pro, 100 on MSP.