so, you have 2 different issues if I understand well:
- your DNS doesn't contain any entry for smtp.domain.com (but do you need one as mail.domain.com already exists and can be used)
- Thunderbird doesn't work when using FQDN. Strange are you sure that config is really the same when switching from IP address to FQDN? I mean in term of port to be used, TLS, authentication ...
did you mean DNS settings in zentyal ebox menu?
In Domain name server resolver I entered with the ip address of DNS domain.
In Infrastructure DNS menu list of domain I entered with :
domain.com --> hostname : mail, mail exchanger : mail, name servers : mail
ip address : 192.168.1.10 (local ip)
this is main.cf postfix config :
# Generated by Zentyal
# See /usr/share/postfix/main.cf.dist for a commented, more complete version
# require helo
smtpd_delay_reject = yes
smtpd_helo_required = yes
strict_rfc821_envelopes = yes
disable_vrfy_command = yes
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no
# appending .domain is the MUA's job.
append_dot_mydomain = no
# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h
myorigin = /etc/mailname
myhostname = mail.domain.com
mydestination = $myorigin,$myhostname,localhost,localhost.$mydomain
smtp_helo_name = mail.domain.com
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
local_recipient_maps = proxy:unix:passwd.byname $alias_maps
relayhost =
transport_maps = hash:/etc/postfix/transport
zarafa_destination_recipient_limit = 1
mynetworks = 127.0.0.0/8
message_size_limit = 4194304
mailbox_size_limit = 0
virtual_mailbox_limit = 0
recipient_delimiter = +
inet_interfaces = all
# Virtual Aliases
virtual_alias_maps = ldap:valiases
valiases_server_host = 127.0.0.1
valiases_search_base = ou=mailalias,ou=postfix,dc=dove
valiases_query_filter = (&(mail=%s)(objectClass=CourierMailAlias))
valiases_result_attribute = maildrop
aliases_bind = no
# Virtual Domains
dovecot_destination_recipient_limit = 1
virtual_transport = dovecot
#virtual_transport = virtual
virtual_mailbox_base = /var/vmail/
virtual_mailbox_maps= ldap:ldapvirtualmap
ldapvirtualmap_server_host = 127.0.0.1:389
ldapvirtualmap_bind = no
ldapvirtualmap_search_base = ou=Users,dc=dove
ldapvirtualmap_query_filter = (&(mail=%s)(!(quota=-1))(objectClass=CourierMailAccount))
ldapvirtualmap_result_attribute = mailbox
virtual_mailbox_domains = ldap:vmaildomains
vmaildomains_server_host = 127.0.0.1
vmaildomains_bind = no
vmaildomains_search_base = ou=postfix,dc=dove
vmaildomains_query_filter = (|(&(objectclass=domain)(domainComponent=%s))(&(objectclass=CourierMailAlias)(mail=@%s)))
vmaildomains_result_attribute = dc, maildrop
virtual_minimum_uid = 100
virtual_uid_maps = static:108
virtual_gid_maps = static:115
## TLS/SSL
smtpd_use_tls = yes
smtpd_tls_note_starttls = yes
smtpd_tls_key_file = /etc/postfix/sasl/postfix.pem
smtpd_tls_cert_file = /etc/postfix/sasl/postfix.pem
smtpd_tls_loglevel = 1
smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination, reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, check_helo_access pcre:/etc/postfix/helo_checks.pcre
#SASL authentication
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain =
broken_sasl_auth_clients = yes
smtpd_tls_auth_only = yes
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_local_domain = $myorigin
content_filter=smtp-amavis:127.0.0.1:10024