Mail, how to make endless mail?

Question

linux

Good afternoon.
The office that provided the service decided to abandon the idea and announced that they were closing mail servers. Since the entire kitchen would have to be moved to the office, the management realized that the mailboxes could be dimensionless. Here I did not particularly argue, since there is no point in proving something to someone until there is no exact data. The equipment was also not purchased, because I don’t know where to start. The task is trivial and there is a lot of information on the Internet, but often it is already old or the systems are so complex that it makes no sense to build a whole DC in an office with 50+ postal addresses.
And the question is actually quite simple, advise a scalable system for mail on linux, or maybe there is already something ready.
Thanks to all

Answer 1

Zimbra, iredmail - ready-made solutions out of the box.
Or manually - a bunch of Postfix / Dovecot (Amavis / Roundcube / Posfixadmin, etc.).

Answer 2

Scaling in your conditions is disabled quotas for disk space and the ability to quickly add space when it is exhausted. Well, the first question is solved in an elementary way, and the second - take care of the cluster expandable file system for the mail spool where your mailboxes will be stored. That CEPH or something like that...
Although I doubt that you will have terabytes there, so a regular FreeNas server exporting an iscsi partition to a mailer will be enough for you. Format the partition under LVM and xfs and keep it) Run out of space - add disks, expand the volume, expand the fs. There is nowhere to add disks - we put another freenas next to it, export another disk from it, add it to your VG, expand the volume, expand the fs ...
And the mail itself - yes, any;) The same iredmail will solve all your problems ....

Answer 3

Maybe www.zentyal.org will work?

Answer 4

Pick up any mail on the LVM partition.
But on the other hand, endless mailboxes are not buzzing.
I know from my own practice that if a user knows that he has unlimited space in his mailbox, he completely ceases to control his attachments. He does not use archivers, in any case, instead of using balls, he uses mail. As a result, a gigabyte per month is easy. 50 users - 50 gigabytes per month.
Think about how you will make backups in such conditions in a year? It will be stupidly physically copied for more than a day.

Answer 5

You do not need to reinvent the wheel, especially if you have not encountered a mail server deployment before and go to pdd.yandex.ru or biz.mail.ru
https://help.mail.ru/biz/sys_admin/migration