Here you see my problem, i have enabled 'local'´s verbose mode in the master.cf
postfix/local[28092]: queue_name: active postfix/local[28092]: queue_id: 1290D2F001C3 postfix/local[28092]: offset: 829 postfix/local[28092]: sender: <sender: E-Mail-Adress> postfix/local[28092]: recipient: <recipient: local Username @ MyMailserver.com> postfix/local[28092]: domain: <myMailServer.com> postfix/local[28092]: local: <recipient: local Username> postfix/local[28092]: user: <recipient: local Username> postfix/local[28092]: extension: null postfix/local[28092]: unmatched: null postfix/local[28092]: owner: null postfix/local[28092]: delivered: <recipient: local Username @ MyMailserver.com> postfix/local[28092]: relay: local postfix/local[28092]: exp_type: 0 postfix/local[28092]: exp_from: null postfix/local[28092]: why: buffer postfix/local[28092]: deliver_switch[2]: local <recipient local Username> recip <recipient: local Username @ MyMailserver.com> exten deliver <recipient: local Username @ MyMailserver.com> exp_from postfix/local[28092]: deliver_alias[3]: local <recipient local Username> recip <recipient: local Username @ MyMailserver.com> exten deliver <recipient: local Username @ MyMailserver.com> exp_from postfix/local[28092]: deliver_alias: hash:/etc/aliases(0,lock|no_regsub|no_proxy|no_unauth|fold_fix|utf8_request) : <recipient local Username> not found postfix/local[28092]: deliver_dotforward[3]: local <recipient local Username> recip <recipient: local Username @ MyMailserver.com> exten deliver <recipient: local Username @ MyMailserver.com> exp_from postfix/local[28092]: deliver_dotforward[3]: set user_attr: <recipient local Username> postfix/local[28092]: set_eugid: euid 1312 egid 1000 postfix/local[28092]: set_eugid: euid 108 egid 113 postfix/local[28092]: deliver_dotforward: path /var/mail/<recipient local Username>/.forward expand_status 0 look_status -1 postfix/local[28092]: deliver_mailbox[3]: local <recipient local Username> recip <recipient: local Username @ MyMailserver.com> exten deliver <recipient: local Username @ MyMailserver.com> exp_from postfix/local[28092]: been_here: mailbox <recipient local Username>: 0 postfix/local[28092]: deliver_mailbox[3]: set user_attr: <recipient local Username> postfix/local[28092]: deliver_command[4]: local <recipient local Username> recip <recipient: local Username @ MyMailserver.com> exten deliver <recipient: local Username @ MyMailserver.com> exp_from postfix/local[28092]: been_here: command <recipient local Username>:1312 /usr/bin/procmail: 0 dovecot[28218]: lda(<recipient local Username>)<28218><y2iAEg15gmA6bgAAVtsF+A>: sieve: msgid=<20210423073645.1290D2F001C3@<myMailServer.com>>: failed to store into mailbox 'INBOX': Quota exceeded (mailbox for user is full) dovecot[28218]: lda(<recipient local Username>)<28218><y2iAEg15gmA6bgAAVtsF+A>: msgid=<20210423073645.1290D2F001C3@<myMailServer.com>>: rejected: Quota exceeded (mailbox for user is full) The local module rewrite the senders e-mail-adress with <localu...@mymailserver.com> , then he want to deliver the mail directly to dovecot-lda who says, there is no space in recipients mailbox. Then the dovecot produce an late bounce with the false mailadress in the error report. Mit freundlichen Grüßen Yours sincerely Pascal Rudolf | Geschäftsführer PADARU-IT | Bielebohstraße 10 | 02736 Beiersdorf @: rud...@padaru.de | www: padaru.de mobil: +49 (0) 17 772 595 32 -----Ursprüngliche Nachricht----- Von: owner-postfix-us...@postfix.org <owner-postfix-us...@postfix.org> Im Auftrag von @lbutlr Gesendet: Freitag, 23. April 2021 09:24 An: Postfix users <postfix-users@postfix.org> Betreff: Re: Change default reject message On 22 Apr 2021, at 12:49, Wietse Venema <wie...@porcupine.org> wrote: > rud...@padaru.de: >> Good evening, >> Unfortunately, I have to revisit my topic from back in the day.... >> >> Sending the proper reject-messages through the postfix works wonderfully, as long as it is an external sender. >> >> But now if a local sender sends an email to the full mailbox, again the Dovecot replies, or the program what generates the message mentioned at the beginning: >> >> ## >> Your message to <localu...@my.server.com> was automatically discarded: >> ## > > Why discard over-quota email? If you allow Dovecot to reject delivery, > then the local sender will receive a proper delivery status notification. Also, discarding email that you accepted is evil. IMO, off course, but I would immediately stop using an mail address in which email that was delivered was deleted by the service. In fact, I have. Either you accept the message and deliver it or you reject the message, anything else is unacceptable. -- Do you have any idea how expensive wool is in Transylvania? Because of the euro.