我目前已经设置了postfix来通过gmail从我的网站转发消息，直到最近它完美的工作。 然而，在上周左右（不知道什么时候），当试图发送电子邮件时，我开始得到下面的错误：
Jul 20 07:40:46 localhost postfix/smtp[11958]: connect to smtp.gmail.com[2001:4860:800a::6c]:587: Network is unreachable Jul 20 07:40:46 localhost postfix/smtp[11958]: connect to smtp.gmail.com[173.194.76.109]:587: Connection refused Jul 20 07:40:46 localhost postfix/smtp[11958]: connect to smtp.gmail.com[173.194.76.108]:587: Connection refused 这是我的configuration文件：
# See /usr/share/postfix/main.cf.dist for a commented, more complete version # Debian specific: Specifying a file name will cause the first # line of that file to be used as the name. The Debian default # is /etc/mailname. #myorigin = /etc/mailname smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no # appending .domain is the MUA's job. append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h #readme_directory = no # TLS parameters smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key smtpd_use_tls=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for # information on enabling SSL in the smtp client. myhostname = [my domain name] alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases #myorigin = /etc/mailname mydestination = [my host name], localhost.localdomain, localhost relayhost = [smtp.gmail.com]:587 mynetworks = 127.0.0.0/8 mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = loopback-only inet_protocols = all ########################################## ##### non debconf entries start here ##### ##### client TLS parameters ##### smtp_tls_loglevel=1 smtp_tls_security_level=encrypt smtp_sasl_auth_enable=yes smtp_sasl_password_maps=hash:/etc/postfix/sasl/passwd smtp_sasl_security_options = noanonymous ##### map username@localhost to [email protected] ##### smtp_generic_maps=hash:/etc/postfix/generic
我的服务器上没有任何变化，据我所知…任何想法可能导致它停止工作？
networking不可达可以忽略，因为这是对ipv6的尝试
你还需要执行tls来encryption连接，这里有一个很好的描述
http://blog.chriskankiewicz.com/post/253/postfix-using-gmail-as-a-relay-host/
在DNSBLs中检查你的IP地址。 您可能已被列入黑名单，或是临时性问题。
我的猜测是通信失败（防火墙问题？）“networking无法访问” – 然后“连接被拒绝”。 拒绝连接也可能是Gmail拒绝你的连接，也许你去了每个帐户的限制发送？