On 4 Oct 2018, at 17:20, Bill Cole wrote:

On 4 Oct 2018, at 10:22, Vlad Ghitulescu wrote:

On 4 Oct 2018, at 12:00, Philip Paeps wrote:
[...]
The only way to make this work reliably is to filter serverside.

I didn't think seriously about this because I didn't have the problem and SpamSieve was more than enough… but now I should probably reconsider.
How does this work?
Is this something that my ISP / domain-provider has to switch on or is it something I should install server-side?

It varies widely. The general rule is that server-side filtering has to be made available by whoever administers your MTA and/or your IMAP server. How you interact with it is an "implementation-specific" detail...

Typically, server-side filtering of mail into various IMAP mailboxes is done at delivery time so if it is available, it is a function of the delivery agent that operates between the SMTP server that accepts the mail and the mailstore from which the IMAP server serves it to you. If you have a shell login on your mail server, you may have the option of using "procmail" which is one of the oldest and still most widely used filtering tools, despite it having been abandoned in disgust and shame by its own creator many years ago. A more modern possibility is an implementation of the Sieve filtering language, often remotely manageable via a web interface or a ManageSieve (RFC 5804) implementation. Some providers (e.g. GMail, Office365) offer their own server-side filtering tools accessed through their web interfaces.

Ok, I'll check mit my domain-provider.
Thanks, Bill!


Regards,
Vlad


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