Dovecot discards mail in a certain situation

Aleš Pečnik ales_pecnik at
Wed Apr 21 12:47:29 EEST 2021

Thank you for your help. It works, but only for e-mail addressed to an 
actual username - i.e., not an alias.

For e-mails addressed to an alias at domain, Postfix doesn't translate the 
alias to username before asking Dovecot, which then replies with "user 
unknown" and mail is rejected.

For example, an e-mail sent to a user over quota and his alias:

    ----- The following addresses had permanent fatal errors -----
<alias at domain>
     (reason: 554 5.7.1 <alias at domain>: Recipient address rejected: 
Unknown user)
<username at domain>
     (reason: 554 5.2.2 <username at domain>: Recipient address rejected: 
Quota exceeded (mailbox for user is full))

Anyway, this is what I added to Dovecot's configuration:

service quota-status {
   executable = quota-status -p postfix
   inet_listener {
     port = 999
   client_limit = 1

And this to Postfix's configuration:

smtpd_recipient_restrictions = check_policy_service inet:localhost:999

Is there any timeline for fixing the bug in the current sieve behaviour 
regarding duplicates?

On 21. 04. 21 03:16, Benny Pedersen wrote:
> 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:
> its a bug, but the workaround is to
> so postfix tempfail before lmtp delivery the first time
> hopefully it credited you report this problem

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