Running and working installation by following:

# 2.3.7.2 (3c910f64b): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.7.2 ()
# OS: Linux 5.9.0-rc5-lja-tv+ x86_64 Ubuntu 20.04.2 LTS
# Hostname: superman.sillywalk.org
auth_debug = yes
auth_debug_passwords = yes
auth_mechanisms = plain login
auth_username_format = %Ln
auth_verbose = yes
auth_verbose_passwords = plain
debug_log_path = /var/log/dovecot-debug.log
info_log_path = /var/log/dovecot-info.log
log_path = /var/log/dovecot.log
mail_debug = yes
mail_location = maildir:~/Maildir/
mbox_write_locks = fcntl
namespace inbox {
  inbox = yes
  location =
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix =
}
passdb {
  driver = pam
}
protocols = imap pop3 lmtp
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = mail
    mode = 0660
    user = postfix
  }
}
service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = mail
    mode = 0660
    user = postfix
  }
}
ssl_cert = </etc/letsencrypt/live/lja.fi/fullchain.pem
ssl_dh = # hidden, use -P to show it
ssl_key = # hidden, use -P to show it
userdb {
  args = username_format=%Ln
  driver = passwd
}
protocol lmtp {
  postmaster_address = postmaster@localhost
}
protocol imap {
  imap_metadata = yes
}
local_name paxsudos.fi {
  ssl_cert = </etc/letsencrypt/live/paxsudos.fi/fullchain.pem
  ssl_dh = # hidden, use -P to show it
  ssl_key = # hidden, use -P to show it
}
local_name paxsudos.com {
  ssl_cert = </etc/letsencrypt/live/paxsudos.com/fullchain.pem
  ssl_dh = # hidden, use -P to show it
  ssl_key = # hidden, use -P to show it
}
local_name lja.fi {
  ssl_cert = </etc/letsencrypt/live/lja.fi/fullchain.pem
  ssl_dh = # hidden, use -P to show it
  ssl_key = # hidden, use -P to show it
}

Postfix condifuration:

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
compatibility_level = 2
inet_interfaces = all
inet_protocols = ipv4
mailbox_size_limit = 51200000
mailbox_transport = lmtp:unix:private/dovecot-lmtp
mydestination = $myhostname $mydomain paxsudos.fi paxsudos.com localhost.$mydomain localhost.localdomain localhost
mydomain = lja.fi
myhostname = mail.lja.fi
mynetworks = 127.0.0.0/8 192.168.1.0/24
myorigin = lja.fi
recipient_delimiter = +
relayhost = [smtp.dnainternet.net]:465
smtp_tls_ciphers = high
smtp_tls_security_level = encrypt
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtp_tls_wrappermode = yes
smtp_use_tls = yes
smtpd_sasl_auth_enable = yes
smtpd_sasl_path = private/auth
smtpd_sasl_type = dovecot
smtpd_tls_CAfile = /etc/letsencrypt/live/lja.fi/chain.pem
smtpd_tls_cert_file = /etc/letsencrypt/live/lja.fi/fullchain.pem
smtpd_tls_ciphers = high
smtpd_tls_key_file = /etc/letsencrypt/live/lja.fi/privkey.pem
smtpd_tls_loglevel = 2
virtual_maps = hash:/etc/postfix/virtual
virtual_transport = lmtp:unix:private/dovecot-lmtp

WORKS LIKE A CHARM :) ... thank you for pointing me the lmtp :) ..


Works with Thunderbird 78.8.1 (latest release)


-- Lauri Jakku


Marc kirjoitti 15.3.2021 klo 10:43:

I assume you are refering to incomming mail. I had sometimes similar issues 
with mbox and having sendmail deliver straight to the mbox file. When I 
switched to delivering to lmtp, I never encountered it anymore. Just put this 
lmtp inbetween.



-----Original Message-----
From: dovecot <dovecot-boun...@dovecot.org> On Behalf Of gmail
Sent: 14 March 2021 23:30
To: dovecot@dovecot.org
Subject: Re: Latest dovecot does not work with latest MUA (thunderbird)


Stuart Henderson kirjoitti 14.3.2021 klo 23.38:
On 2021-03-14, lja@koti <l...@lja.fi> wrote:
# 2.3.7.2 (3c910f64b): /etc/dovecot/dovecot.conf
That's nowhere near the latest Dovecot.


Updated dovecot to bleeding edge, and still got same issue.

# 2.4.devel (b0f498b69): /usr/local/etc/dovecot/dovecot.conf
# OS: Linux 5.9.0-rc5 x86_64 Ubuntu 20.04.2 LTS
# Hostname: superman.sillywalk.org
auth_debug = yes
auth_debug_passwords = yes
auth_mechanisms = plain login
auth_verbose = yes
auth_verbose_passwords = plain
debug_log_path = /var/log/dovecot-debug.log
info_log_path = /var/log/dovecot-info.log
log_path = /var/log/dovecot.log
mail_debug = yes
mail_location = maildir:~/Maildir/
mbox_write_locks = fcntl
namespace inbox {
    inbox = yes
    location =
    mailbox Drafts {
      special_use = \Drafts
    }
    mailbox Junk {
      special_use = \Junk
    }
    mailbox Sent {
      special_use = \Sent
    }
    mailbox "Sent Messages" {
      special_use = \Sent
    }
    mailbox Trash {
      special_use = \Trash
    }
    prefix =
}
passdb {
    driver = pam
}
protocols = imap pop3
service auth {
    unix_listener /var/spool/postfix/private/auth {
      group = mail
      mode = 0660
      user = postfix
    }
}
ssl_cert = </etc/letsencrypt/live/maindomain.fi/fullchain.pem
ssl_key = # hidden, use -P to show it
userdb {
    driver = passwd
}
protocol imap {
    imap_metadata = yes
}
local_name businessdomain.fi {
    ssl_cert = </etc/letsencrypt/live/businessdomain.fi/fullchain.pem
    ssl_key = # hidden, use -P to show it
}
local_name businessdomain.com {
    ssl_cert = </etc/letsencrypt/live/businessdomain.com/fullchain.pem
    ssl_key = # hidden, use -P to show it
}
local_name maindomain.fi {
    ssl_cert = </etc/letsencrypt/live/maindomain.fi/fullchain.pem
    ssl_key = # hidden, use -P to show it
}

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