I have just learned that a change has been made to H9's systems to "combat spam". This change effectively disables the Mailman mailing lists. Apparently, Mailman mailing lists will now no longer accept any emails from anyone who didn't use a H9 SMTP server to send the email - which is usually just about everyone that uses such lists.
Mailman mailing lists are used to allow large groups of people to send emails to each other. If there are 100 people on the mailing list, then the list can be configured to allow all 100 members to send emails to
listname@domain.com, and have their email distributed to everyone else on the list. If the system is changed to no longer accept emails from foreign SMTP servers, then the only people that can send to the mailing lists are the hosting account holders, and only if they're using H9 SMTP servers, which no-one wants to do anyway because they're so often blacklisted.
This change was made without any warning to H9 customers. What's the point in having an "Announcements" forum if they don't post the changes they're making to the network there?
The Mailman software already has its own built-in anti-spam solution. There doesn't appear to be any benefit in making this change.
I'm hoping they'll realise the significance of this change and make some sort of compromise.
Mark.