我正在用我的postfix来解决问题。 我不断收到/var/log/mail.err中的标题错误，无法发送。
postconf的结果-n：
alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes compatibility_level = 2 inet_interfaces = all inet_protocols = all mailbox_command = mailbox_size_limit = 0 mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mynetworks_style = subnet myorigin = /etc/mailname readme_directory = no recipient_delimiter = + relayhost = smtp_sasl_auth_enable = yes smtp_sasl_path = private/auth smtp_sasl_security_options = noplaintext smtp_sasl_type = dovecot smtp_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem smtp_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtp_use_tls = yes smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache 如果你需要更多的细节，我很乐意提供和感谢我的救星！