#smtpcallbacks

Live, measured metrics for the hashtag #smtpcallbacks from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.

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0
Uses / 7 days
Mastodon
0
Accounts / 7 days
Mastodon
5
Recent posts
Mastodon
~0/hr
Recent pace
Mastodon · last 5
1.6
Avg reactions / post
Mastodon · last 5
—
Reddit posts / month
Reddit search
—
Open-web mentions
hashtag.org Firehose

Day-by-day usage

measured · fosstodon.org (Mastodon public tags API) · fetched 2026-10-31 06:31 UTC
0
10-25
0
10-26
0
10-27
0
10-28
0
10-29
0
10-30
0
10-31

0 uses by 0 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.

Related hashtags

measured · fosstodon.org (Mastodon public search API) · fetched 2026-10-31 06:31 UTC

No related tags with measured usage found for #smtpcallbacks.

Live pulse

measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-10-31 06:31 UTC

Everything below is measured over the latest 5 public posts (spanning ~10414 hours).

Posting hours (UTC)

00:0012:0023:00

Languages: English (5)

Avg boosts / post: 0.6

Top of the latest posts

  • I wonder whether they also believe in the tooth fairy: Jan 25 07:48:32 skapet spamd[52525]: (GREY) 111.68.23.116: <> -> <[email protected]> Jan 25 07:48:32 skapet spamd[43842]: new entry 111.68.23.116 fr

    Peter N. M. Hansteen@[email protected]♥ 4↻ 22026-01-25 09:03 UTCView post →

  • If you are a #postfix user and think what is described in this HOWTO http://www.postfix.org/ADDRESS_VERIFICATION_README.html[1] is useful, I can tell you: IT IS NOT. Longer version: https://nxdomain.no/~peter/twenty-plus_years_on_smtp_callb

    Peter N. M. Hansteen@[email protected]♥ 3↻ 02026-04-14 19:21 UTCView post →

  • Somehow, this is still a thing: Dec 8 00:05:22 skapet spamd[27974]: (GREY) 111.68.22.216: <> -> <[email protected]> Does this mean "Twenty-plus years on, SMTP callbacks are still pointless and need to di

    Peter N. M. Hansteen@[email protected]♥ 1↻ 02025-12-08 07:23 UTCView post →

#smtpcallbacks across platforms

every network with a public tag surface

Follow #smtpcallbacks straight to each platform’s own tag page. Where a platform publishes open data we measure it above; the rest lock their numbers behind paid APIs, so we link rather than guess.

X (Twitter) ↗Instagram ↗TikTok ↗Facebook ↗LinkedIn ↗YouTube ↗Threads ↗Bluesky ↗Mastodon ↗Reddit ↗Pinterest ↗Tumblr ↗

Every number above is measured from a named public API at the shown fetch time. Nothing is estimated or extrapolated. Platforms that lock their data behind paid APIs are not shown. Agents: the same numbers, as JSON, at /api/hashtags/smtpcallbacks