dovcot -n # 2.3.7.2 (3c910f64b): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.7.2 () # OS: Linux 5.4.0 x86_64 Ubuntu 20.04.3 LTS ext4 # Hostname: softlinksys.com auth_mechanisms = plain login auth_username_format = %n mail_location = maildir:/var/mail/vhosts/%d/%n mail_privileged_group = mail namespace inbox { inbox = yes location = mailbox Drafts { auto = create special_use = \Drafts } mailbox Junk { auto = create special_use = \Junk } mailbox Sent { auto = create special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { auto = create special_use = \Trash } prefix = } passdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } protocols = imap pop3 lmtp service auth-worker { user = vmail } service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } unix_listener auth-userdb { mode = 0600 user = vmail } user = dovecot } service imap-login { inet_listener imap { port = 143 } inet_listener imaps { port = 993 ssl = yes } } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } } service pop3-login { inet_listener pop3 { port = 110 } inet_listener pop3s { port = 995 ssl = yes } } ssl = required ssl_cert = </etc/letsencrypt/live/mail.softlinksys.com/fullchain.pem ssl_client_ca_dir = /etc/ssl/certs ssl_dh = # hidden, use -P to show it ssl_key = # hidden, use -P to show it ssl_min_protocol = TLSv1.2 ssl_prefer_server_ciphers = yes userdb { args = uid=vmail gid=vmail home=/var/mail/vhosts/%d/%n driver = static } -----Original Message----- From: owner-postfix-us...@postfix.org <owner-postfix-us...@postfix.org> On Behalf Of Wietse Venema Sent: Friday, December 3, 2021 1:35 PM To: Postfix users <postfix-users@postfix.org> Subject: Re: virtual mailbox domains?? <mailto:post...@aecperformance.com> post...@aecperformance.com: > How can I debug/resolve this problem? By sharing Postfix logs, in addition to Postfix configurations. "email to X bounces" is not sufficient to determine *WHY* delivery is failing. Wietse