Dovecot discards mail in a certain situation

[Benny Pedersen]

On 2021-04-20 20:41, Aleš Pečnik wrote:
> I'm using Dovecot with Postfix (via LMTP). Because Postfix doesn't
> de-duplicate recipients, I'm using sieve to drop duplicates, following
> this recipe:
> https://serverfault.com/questions/112958/postfix-aliases-and-duplicate-e-mails-how-to-fix

its a bug, but the workaround is to

https://doc.dovecot.org/configuration_manual/quota_plugin/

so postfix tempfail before lmtp delivery the first time

hopefully it credited you report this problem