On 6/16/20 4:36 AM, Jonathan Ashby wrote: > Hello > > I wonder if you can help. > > My organisation represents and supports GPs across most of London. We have > elected representatives and we use Mailman mailing lists to provide > listservers to elected representatives. > > We currently use version 2.1.12 (http://lists.lmc.org.uk/mailman/admin) but I > am aware of changes with TLS and DMARC are starting to effect our messages to > listserver members. An example is doctors.org email addresses do not accept > our listserver messages because the DMARC settings in their systems sees the > ‘sender’ is sending mail out purporting to be from the email address of the > person posting the entry on the listserver, which they regard as spoofing. > > We send emails to NHS mail addresses which currently reach their destination > but I am aware that NHS mail is going to move to Exchange Online next month. > > I am looking at ways to future proof our listservers as they are such an > important part of our communication strategy.
I suggest at a minimum you upgrade your Mailman to a version that provides good DMARC mitigation support. That would be 2.1.18+, but the latest is 2.1.33, and 2.1.34 will be released very soon. If you are gouing to upgrade from source, there's no reason not to upgrade to the latest release or even the head of the branch at <https://code.launchpad.net/~mailman-coders/mailman/2.1>. If you need specific help/advice on upgrading, we can help with that too if we know how your current Mailman was installed. Regarding TLS, Mailman 2.1.23+ can do SASL authentication and STARTTLS security when connecting to the outgoing MTA. This is only really meaningful if the outgoing MTA is not on the local Mailman machine. For a local MTA, TLS delivery to recipients is configured in the MTA, not in Mailman. -- Mark Sapiro <m...@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan ------------------------------------------------------ Mailman-Users mailing list -- mailman-users@python.org To unsubscribe send an email to mailman-users-le...@python.org https://mail.python.org/mailman3/lists/mailman-users.python.org/ Mailman FAQ: http://wiki.list.org/x/AgA3 Security Policy: http://wiki.list.org/x/QIA9 Searchable Archives: https://www.mail-archive.com/mailman-users@python.org/ https://mail.python.org/archives/list/mailman-users@python.org/
