Some systems are experiencing issues

Stickied Incidents

17th July 2025

Mailing Lists Emails sent from Mailman lists being marked as spam on some providers

Mailman mailing lists are experiencing issues with emails sent to some providers (such as GMail and Yahoo) ending up in user's Junk folders.

This follows a period of subscription spam targeting Mailman, leading to users on those (and possibly some other) platforms that received the resulting subscription notification or rejected sign-up emails to mark them as spam, downgrading our Mailman server's IP and domain reputation.

Measures have been put in place to prevent significant sign-up spam and other measures are being considered. Where possible we are monitoring the rating of the Mailman server by these providers, which should improve after the spam rate has remained below their threshold for a period of time.

  • Update: Additional measures have been put in place to attempt to prevent spam subscriptions including the use of a Captcha. Please report to Admin any issues with legitimate users subscribing or unsubscribing.

  • Past Incidents

    26th July 2025

    No incidents reported

    25th July 2025

    No incidents reported

    24th July 2025

    No incidents reported

    23rd July 2025

    No incidents reported

    22nd July 2025

    No incidents reported

    21st July 2025

    No incidents reported

    20th July 2025

    No incidents reported

    19th July 2025

    Mailing Lists Mailman and Email Services on Mailman Temporarily Shut Down

    As an emergency measure, the Mailman and email service on the Mailman server were shut down for several hours to prevent further subscription spam from further worsening the server's IP reputation.

    Additional measures have been put in place and Mailman and email service on the Mailman server were re-enabled this morning.

    Mailman: Stopped 19th July at 13:22

    Exim4: Stopped 19th July at 14:20

    Exim4: Started 20th July at 09:38

    Mailman: Started 20th July at 10:10

  • Mitigations were put in place.

    Exim4: Started 20th July at 09:38

    Mailman: Started 20th July at 10:10