Hello,

I noticed that sieve's duplicate function is not working when the MessageID header has a line break and I have encountered messages originating from Microsoft 365 this way.

For example:

# test 1

From: mailto:teste@domain.com.br teste@domain.com.br

To: mailto:cron@domain.com.br cron@domain.com.br

Subject: test

Message-Id: mailto:854115.209399851-sendEmail@pa1 854115.209399851-sendEmail@pa1

Date: Wed, 19 Jun 2024 12:35:16 -0300 (-03)

Test

# test 2

From: mailto:teste@domain.com.br teste@domain.com.br

To: mailto:cron@domain.com.br cron@domain.com.br

Subject: test

Message-ID:

mailto:854115.209399851-sendEmail@pa1 854115.209399851-sendEmail@pa1

Date: Wed, 19 Jun 2024 12:35:16 -0300 (-03)

test

# dovecot log

Jun 19 12:59:33 server1 dovecot[513090]: lmtp(cron@domain.com.br) mailto:cron@domain.com.br)%3c2993309%3e%3c4AeXHGUAc2adrC0AZCVTkw <2993309><4AeXHGUAc2adrC0AZCVTkw>: sieve: subject=test from:teste@domain.com.br sender:teste@domain.com.br to: cron@domain.com.br mailto:cron@domain.com.br size:1010 msgid=854115.209399851-sendEmail@pa1 mailto:854115.209399851-sendEmail@pa1 status=stored mail into mailbox 'INBOX' delivery_time=3 session_time=1

Jun 19 12:59:35 server1 dovecot[513090]: lmtp(cron@domain.com.br) mailto:cron@domain.com.br)%3c2993309%3e%3csKNOK2cAc2adrC0AZCVTkw <2993309><sKNOK2cAc2adrC0AZCVTkw>: sieve: subject=test from:teste@domain.com.br sender:teste@domain.com.br to: cron@domain.com.br mailto:cron@domain.com.br size:1014 msgid=854115.209399851-sendEmail@pa1 mailto:854115.209399851-sendEmail@pa1 status=stored mail into mailbox 'INBOX' delivery_time=3 session_time=1

# sieve rule

require ["duplicate", "fileinto", "envelope", "variables"];

if envelope :matches "from" "*" { set "sender" "${1}"; }

if header :matches "subject" "*" { set "subject" "${1}"; }

if header :matches "message-id" "*" {

if duplicate :seconds 300 :uniqueid "${sender} ${subject} ${0}"{

    discard;

}

}

Regards,

Ricardo