Re: Which is better? Microsoft Exchange 2016 or Linux-based SMTP Servers?

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On 07/19/18 09:14, Johnny Hughes wrote:
On 07/18/2018 04:05 PM, Valeri Galtsev wrote:


On 07/18/18 14:36, Johnny Hughes wrote:
On 07/18/2018 01:58 PM, Valeri Galtsev wrote:


<snip>

But are you guys really telling you think the calendaring / scheduling
for individual users and the main corporate account, etc. .. are
working
well enough with any Linux solution.

I must confess, my servers are FreeBSD, but I'm quite sure the same is
doable easily on Linux.

We use for calendars Owncloud (may migrate to nextcloud in some future
to come). That authenticates against LDAP.

And does that calendar solution allow for things like:

1)  Allowing all users in the organization to see users calendars and
see when they are free to schedule a meeting with them.

Yes at least about a part of it: calendars can be shared with some
people or with everybody (which we didn't do, so I may be not 100%
presenting "experimental fact" here). Not certain about "free/not free"
mapped on calendars though.


2) Allow for designated people to schedule meetings for others (ie, your
secretary/office assistant can schedule meetings for people, etc.)

Yes, you can share calendar with anybody, and can set any set of choices

can read
can write
can "re-share" your calendar

You can share stuff to external people, and set individual
authentication for them independent of our system (in general, it is not
just calendars, but we use it for mostly synchronizing between all of
your devices, and also sharing: files, calendars, address book; it can
also be bookmarks, and there are variety of plugins expanding what else
can be accessed/synchronized via web/dav)


3) Allow a calendar to schedule shared items .. like meeting rooms,
shared vehicles, etc.  So that people can check those out for specifc
time windows, etc.

No, but for resource booking (if I read the question correctly) we use
mrbs (https://mrbs.sourceforge.io/). I know, that is not "integrated"
for you to have everything in one place. I never had time to look for
extention/plugin to suck from mrbs booked slot into one's calendar.


Those are just a couple of minor things a lot of solutions can't do

And do they work with imap, etc.

No, owncloud/nextcloud don't work with IMAP as far as I know. Mail
server is separate issue. Zimbra in that respect IS "integrated
collaborative environment". And so is Kolab. They both are lacking
per-user spam preferences. One more thing that added some minus for each
of them in my estimate what to choose is: behind each of them there is
commercial company. And that in my looooong experience significantly
increases the chance one day openly available incarnation of each may
become no longer available for us, and I will have to find replacement
in a rush and find the way to migrate to it, and the more sophisticated
the thing is, the trickier the migration will be.

My answers are mostly about owncloud which we use for quite some time.
Nextcloud is fork of owncloud, and to my regret nextcloud doesn't work
with postgresql, only with mysql/MariaDB, whereas owncloud works with
postgresql as well as with mysql/MariaDB (still we have some reasons to
migrate to nextcloud at some point).

I hope, someone with more knowledge will chime in.



Don't get me wrong.  I've run qmail, postfix, and zimbra mail servers
with IMAP, along with webmail front ends (roundcude, squirrel mail,
etc), for windows, mac and linux clients for several companies (all on
CentOS of course :D) .. I just don't think that calendaring that I have
seen is as user friendly as google calendar (for example).  But I'm all
for people running mail servers on CentOS (or any other Linux) if they
want !

No, I'm not getting you wrong. You gave nicely put set of properties [some]one may be interested to know of, which I tried to answer. Also: Thanks, Arif, for correcting/expanding in the other post what I said about owncloud/nextcloud. That was extremely helpful!

<rant>
As far as google anything goes, not everybody volunteers one's information into paws of google (and quite likely one or more of 3 letter agencies collecting information that way). I know (call it educated guess) that about 70% of messages I send are ending up in google databases whether I want it or not. Someone said quite some time ago: you don't need to recruit spies anymore, just roll out "free" services, and information will trickle to you. I am old enough to know what collection of information on everybody leads to (Hitler Germany, Stalin Russia, ...), but I also know that the worst lesson of history is: people do not learn lessons of history. So, I do the best I can do: roll out services people I work for may need, and avoid by any means advertising google whatever myself, I just keep neutral when that surfaces in discussions with my people.
</rant>


Valeri



Zimbra does not work very well with
Thunderbird and Lighting (for example) .. many solutions don't work with
Windows or Mac clients, etc.



For mail we use postfix, dovecot and maia for spam filtering (the last
harnesses spamassassin, clamav and few other things).

Of course, zimbra you mentioned earlier in the thread (or was it not
you?), and Kolab provide more corporate-like collaboration environments,
but I shied away from them as I set myself a goal to give users
individual handle on spam/virus filtering in email, and neither of them
has per-user spam preferences (take it with the grain of salt, I might
have missed something...)

Just my $0.02.

<snip>



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--
++++++++++++++++++++++++++++++++++++++++
Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247
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