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mail.python.org not listening on IPv6

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#304 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale

Research direction

Start by reproducing the IPv4 and IPv6 connections with the netcat commands shown, and inspect the mail.python.org service and its Postfix configuration. Done means mail.python.org accepts SMTP connections on port 25 over IPv6 as well as IPv4.

Written by the indexing model from the issue text.

Description

mail.python.org do have an IPv6 (and an IPv4):

$ dig A +short mail.python.org
188.166.95.178
$ dig AAAA +short mail.python.org
2a03:b0c0:2:d0::71:1

But it does not accept emails on its IPv6 interface:

$ netcat -4 mail.python.org 25
220-mail.python.org ESMTP Postfix

$ netcat -6 mail.python.org 25
Dominant language
Hurl
Stars
124
Forks
67
Avg merge
8h 40m
Merged PRs (30d)
5

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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