Conditionally Filter Mails During IMAP Fetch

[Michael Slusarz]

> On May 16, 2017 at 1:05 AM Ory Drilon <odrilon at fastmail.com> wrote:
> 
> 
> Hi, is there a way to arbitrarily filter out mails at the moment the
> IMAP request is made, based on properties of the IMAP session and the
> mail itself?
> 
> All the filtering methods I find occur during delivery time.

imapsieve: https://tools.ietf.org/html/rfc6785

Although obviously triggering filtering based on a FETCH itself doesn't make much sense and isn't supported by imapsieve (triggering based on flag change *caused* by FETCH is supported however).

michael