On 2019-02-21 22:14, Christoph Haas via dovecot wrote:
NO! My mail storage is mdbox. And at the moment I have no intention
to
convert it to Maildir!
Could I ask why? maildir is a better storage format is almost every
respect.
well, I have a mailbox with about 50k emails ..., so one reason seems
to me better backup performance with mdbox, since there are much less
files to save.
Assuming that you backup regularly then maildir is much better, because
new emails show up as new files, while old ones are left unchanged. This
means that an incremental backup only has to process new emails. With
mailbox, the file for the entire folder changes every time a new email
is delivered or the user edits any of them, so the whole mailbox needs
to be backed up again, resulting in far more I/O and time.
The main disadvantage that I have heard is that maildir consumes a lot
of inodes, but you can fix that by formatting your filesystem with more
to begin with. The ext4 default is 16k per inode, but it is easy to set
a different value when you format, or use an FS that does not suffer
from that limitation such as XFS, (I use btrfs so I can snapshot my
maildir)
[...]
For my day job I work for Sophos (A cyber security vendor), so all
this is familiar to me. If you have the budget for a commercial
product, then Sophos PureMessage does have postfix support. Technical
details here:
https://docs.sophos.com/msg/pmx/help/en-us/msg/pmx/tasks/GSGConfigExtPostfixConfig.html
Other AV vendors probably have similar support, but I don't know any
details.
-- David Pottage
I know about Sophos. Since my infrastructure is only for me and my
family, I'll use the SAV9-free package ... and will try to integrate
this with Postfix or AmaVisd.
I am not certain, but I think the free versions of Sophos won't work as
an email filter to avoid taking sales of the comercal product. I think
you may have to stick with ClamAV, and just use Sophos on your
endpoints.
--
David Pottage
