4 ms·

I've not used sieve, but afaik fastmail supports sieve, and according to this: https://tools.ietf.org/html/rfc5173 https://tools.ietf.org/html/rfc5173 It might

by e12e 9y ago

I've not used sieve, but afaik fastmail supports sieve, and according to this: https://tools.ietf.org/html/rfc5173 https://tools.ietf.org/html/rfc5173 It might be possible to match on non-empty text/plain?