我已经配置了 postfix SMTP 服务器，仅使用以下配置来发送邮件，我已经使用 cyrus-sasl 通过 openLDAP 进行身份验证，我想实现 SMTP 端口 25 以使用不安全的连接，同时在端口 587 上建立安全的 TLS 连接
这是我的 master.cf 文件片段
# ==========================================================================
# service type private unpriv chroot wakeup maxproc command + args
# (yes) (yes) (no) (never) (100)
# ==========================================================================
smtp inet n - n - - smtpd -v
587 inet n - n - - smtpd -v
#smtp inet n - n - 1 postscreen
#smtpd pass - - n - - smtpd
#dnsblog unix - - n - 0 dnsblog
#tlsproxy unix - - n - 0 tlsproxy
#submission inet n - n - - smtpd
# -o syslog_name=postfix/submission
# -o smtpd_tls_security_level=encrypt
# -o smtpd_sasl_auth_enable=yes
# -o smtpd_tls_auth_only=yes
# -o smtpd_reject_unlisted_recipient=no
# -o smtpd_client_restrictions=$mua_client_restrictions
# -o smtpd_helo_restrictions=$mua_helo_restrictions
# -o smtpd_sender_restrictions=$mua_sender_restrictions
# -o smtpd_recipient_restrictions=
# -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
# -o milter_macro_daemon_name=ORIGINATING
#smtps inet n - n - - smtpd
# -o syslog_name=postfix/smtps
# -o smtpd_tls_wrappermode=yes
# -o smtpd_sasl_auth_enable=yes
这是 main.cf 片段：
# USER SPECIFIC SETTINGS -
transport_maps = hash:/etc/postfix/transport
# STMP FOR SENDING
smtp_use_tls = yes
smtp_tls_note_starttls_offer = yes
smtp_tls_key_file = /certs/private/server.key
smtp_tls_cert_file = /certs/server.cer
smtp_tls_CAfile = /etc/pki/tls/certs/ca-bundle.crt
smtp_tls_CApath = /etc/pki/tls/certs
smtp_tls_mandatory_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
smtp_tls_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
smtp_tls_exclude_ciphers = EXP, MEDIUM, LOW, DES, 3DES, SSLv2
smtp_tls_ciphers = high
smtp_tls_security_level = encrypt
smtp_sasl_path = /etc/sasl2/smtpd.conf
smtp_sasl_type = cyrus
smtp_sasl_security_options = noanonymous
smtp_sasl_tls_security_options = noanonymous
smtp_sasl_mechanism_filter = plain, login
# SMTPD FOR RECEIVING
smtpd_use_tls = yes
smtpd_tls_auth_only = yes
smtpd_tls_key_file = /certs/private/server.key
smtpd_tls_cert_file = /certs/server.cer
smtpd_tls_CAfile = /certs/local-ca.cer
smtpd_tls_dh1024_param_file = /etc/pki/tls/private/postfix.dh.param
smtpd_tls_loglevel = 2
smtpd_tls_session_cache_timeout = 3600s
smtpd_tls_session_cache_database = btree:/var/lib/postfix/smtpd_tls_cache
smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
smtpd_tls_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
smtpd_tls_exclude_ciphers = EXP, MEDIUM, LOW, DES, 3DES, SSLv2
smtpd_tls_ciphers = high
tls_random_source = dev:/dev/urandom
tls_high_cipherlist = kEECDH:+kEECDH+SHA:kEDH:+kEDH+SHA:+kEDH+CAMELLIA:kECDH:+kECDH+SHA:kRSA:+kRSA+SHA:+kRSA+CAMELLIA:!aNULL:!eNULL:!SSLv2:!RC4:!MD5:!DES:!EXP:!SEED:!IDEA:!3DES
tls_medium_cipherlist = kEECDH:+kEECDH+SHA:kEDH:+kEDH+SHA:+kEDH+CAMELLIA:kECDH:+kECDH+SHA:kRSA:+kRSA+SHA:+kRSA+CAMELLIA:!aNULL:!eNULL:!SSLv2:!MD5:!DES:!EXP:!SEED:!IDEA:!3DES
cyrus_sasl_config_path = /etc/sasl2/
broken_sasl_auth_clients = yes
smtpd_tls_security_level = encrypt
smtpd_sasl_path = smtpd
smtpd_sasl_type = cyrus
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous, noplaintext
smtpd_sasl_tls_security_options = noanonymous
如果我更改 main.cf，它将影响整个服务器，有人可以指导我如何实现上述场景吗？