[Mailman-Users] Re: Mailman 2.1.12 and issues with TLS 1.2 and DMARC

2020-06-16 Thread Mark Sapiro 
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
.

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 The highway is for gamblers,
San Francisco Bay Area, Californiabetter use your sense - B. Dylan
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[Mailman-Users] Mailman 2.1.12 and issues with TLS 1.2 and DMARC

2020-06-16 Thread Jonathan Ashby 
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.

Are you able to assist in providing me with guidance on the steps I should be 
taking?

Many thanks in advance.

Best wishes.

Jonathan

Jonathan Ashby
Head of Communications and ICT
Londonwide LMCs and Londonwide Enterprise Ltd
Direct dial: 020 3818 6228
Mobile: 07768 109601
Fax: 020 7383 7442
Email: jonathan.as...@lmc.org.uk
Web: www.lmc.org.uk
Twitter: @LondonwideLMCs


Visit 
www.lmc.org.uk/coronavirus-covid-19 
for the latest official resources and guidance on covid-19.

Remember that you can use WhatsApp and FaceTime for online consultations as 
well as the usual online tools.

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Londonwide Enterprise Limited is a wholly owned subsidiary of Londonwide Local 
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Londonwide Local Medical Committees Limited and Londonwide Enterprise Limited 
provide guidance and support to GPs and practice teams in the Londonwide area. 
Additionally Londonwide Local Medical Committees Limited provides 
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advises individuals or practices to obtain independent legal or financial 
advice.



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[Mailman-Users] Re: Mailman3 installation for large organization

2020-06-16 Thread Carl Zwanzig 

Hello,

On 6/16/2020 8:27 AM, Waqas Ahmed Khan wrote:


I have been given the task to install Mailman3 for a large organization,
where the list will send emails to 80-100K users.


First, you probably want to be asking on the mailman3 list-
https://lists.mailman3.org/mailman3/lists/mailman-us...@mailman3.org/
(this list is mostly mailman2)

and read some of the docs at https://docs.mailman3.org/en/latest/


1. How to do the hardware sizing and what should be hardware/VM
configuration?
2. Should we install an email server ( Postfix) on the same server?
3. Can we use an external SMTP server like GMAIL/Office365 to route emails,
is there any guide to configuring this?


Yes, maybe, it depends how many total lists? how many messages per day 
per list? to how many recipients? how big are the messages? how fast do they 
need to be delivered? Are the messages "personalized"?  (Sending one 
non-personalized message once a day to 100k people is vastly different from 
sending 50 personalized messages to 50 lists, etc.)


Oh, and how much bandwidth is available to the server? In the best of times 
(and if my math is right), a 1gb/s 'net connection might only send 2k 
messages/second if they're small and the far-end servers are willing. (That 
is a complete WAG, but illustrative.)



4. How to avoid blacklisting of mailing list IPs?


Don't send spam, get the DKIM and SPF records right, avoid sending from IP 
addresses that are already in blacklists :).


Later,

z!
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[Mailman-Users] Mailman3 installation for large organization

2020-06-16 Thread Waqas Ahmed Khan 
Hi,

I have been given the task to install Mailman3 for a large organization,
where the list will send emails to 80-100K users.

I have the following questions:

1. How to do the hardware sizing and what should be hardware/VM
configuration?
2. Should we install an email server ( Postfix) on the same server?
3. Can we use an external SMTP server like GMAIL/Office365 to route emails,
is there any guide to configuring this?
4. How to avoid blacklisting of mailing list IPs?

Regards,
*Waqas Ahmed Khan*
p: +923212608044
Skype: waqas-ahmed00 
waqas.ahm...@gmail.com

[image: LinkedIn] 


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