[Users] Alliance Call reading material on next crowd funder: Zimbra Mailing Lists

[David Sommerseth]

On 11/08/17 11:20, Barry de Graaff wrote:
> Hello David,
> 
> I looked into this, and changing this from the java parts, will be a bit difficult.
> 
> Do you have an example of `postfix header-rewrite magic` so I can take a look at that?

I've haven't spent much time digging into this, I just know from Postfix
experience it can do a lot of magic :)

But I would start to look at smtp_generic_maps and
canonical_{maps,classes} ... they seem to be at least related to header
rewrites.


David S.



> ----- Original Message -----
> From: "David Sommerseth" <dazo at eurephia.org>
> To: "Barry de Graaff" <info at barrydegraaff.tk>, users at lists.zetalliance.org, devel at lists.zetalliance.org
> Sent: Tuesday, 8 August, 2017 16:32:10
> Subject: Re: [Users] Alliance Call reading material on next crowd funder: Zimbra Mailing Lists
> 
> On 08/08/17 10:36, Barry de Graaff wrote:
>> Hello All,
>>
>>
>> The next alliance crowd-funder, will be about adding mailing list
>> functionality.
>>
>> I looked into Sympa and Mailman, and while I think integrating these is
>> possible
>>
>> it would be a rather large undertaking and potentially one that would
>> drag on
>>
>> for some time.
>>
>> Therefore I am thinking about using Zimbra distribution lists and extend
>> those with mailing
>> list functionality.
>>
>>
>> Here is the gist, so we can talk about it during the call:
> This looks reasonable as a light-weight mailing list.
> 
> However, one of the biggest challenges using Zimbra Distribution Lists
> is that it doesn't do anything with the envelope header (Return-Path).
> So if I send an e-mail to devel at zeta....org , the Return-Path used when
> forwarding the mail to the recipients will carry my dazo at eu....org address.
> 
> This will make SPF checks choke, and for those who have "-all" in the
> SPF rule and the recipients mailserver is strictly configured to deny
> e-mails where SPF fails, those mails never reaches that subscribers
> mailing list.
> 
> But if the Return-Path was changed to become, for example,
> devel at zeta....org, it would be the SPF rules of zeta....org which would
> need to pass - which then would be correct.
> 
> Now, it is probably possible to so some postfix header-rewrite magic
> under the hood.  But ideally, this should happen automatically when
> setting up a DL.
> 
> 


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