Unless there is such setting somewhere in your base config, I would strongly
suggest 
 
auth_username_format = %{user|lower}
 
Aki
     On 01/02/2025 12:18 EET John Muccigrosso via dovecot
     <dovecot@dovecot.org> wrote:
      
      
     Boom! That was it.
      
     At the end of the day, then, here is my local.conf file:
      
     ---
     dovecot_config_version = 2.4.0
     dovecot_storage_version = 2.4.0
      
     default_vsz_limit = unlimited
      
     # Enable wanted protocols:
     protocols {
     imap = yes
     lmtp = yes
     }
      
     mail_home = /Users/%{user}
     mail_driver = maildir
     mail_path = ~/Maildir
      
     mail_uid = <username>
     mail_gid = admin
      
     default_login_user = _dovenull
     default_internal_user = _dovecot
     default_internal_group = mail
      
     # Setting limits.
     default_process_limit = 10
     default_client_limit = 50
      
     namespace inbox {
     inbox = yes
     separator = /
     }
      
     passdb passwd-file {
     passwd_file_path = /Users/%{user}/passwd
     }
     ---
      
     Thanks to Timo and Aki for the help.
      
      
          On Feb 1, 2025, at 10:16, Timo Sirainen via dovecot
          <dovecot@dovecot.org> wrote:
           
          On 1. Feb 2025, at 10.27, John Muccigrosso via dovecot
          <dovecot@dovecot.org> wrote:
               Fatal: setrlimit(RLIMIT_DATA, 2147483648):
               Invalid argument
                
                
               The old(?) solution doesn't work for me:
                
               default_vsz_limit = 0
                
               It reports: doveconf: Fatal: Error in
               configuration file /opt/homebrew/etc/dovecot/
               dovecot.conf: service(log): vsz_limit is too low
          Use unlimited, not 0. I guess the error message should also
          mention that.
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