问题是，我有一个安装了 centOS 6 的 VPS，我可以向任何人发送电子邮件，但我自己的交换服务器除外，
4 月 29 日 11:50:30 amazonnet postfix/smtp[16535]：2B6FF3CC49A：to=，中继=gmail-smtp-in.l.google.com[173.194.78.26]：25，延迟=1.1，延迟=0.06/0.03 /0.27/0.73，dsn=2.0.0，状态=已发送（250 2.0.0 OK 1430308230 h9si43435938wje.62 - gsmtp）
4 月 29 日 11:51:36 amazonnet postfix/smtp[16535]：1AFB93CC49A：to=，中继=无，延迟=30，延迟=0.03/0/30/0，dsn=4.4.1，状态=延迟（连接到mail.amazonnet.hu[81.183.214.140]:25：连接超时）
我也无法从 SSH 远程登录我的域 mail.amazonnet.hu，因为它超时，但我可以从外部远程登录它。
soft_bounce = no
queue_directory = /var/spool/postfix
command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
mail_owner = postfix
# The default_privs parameter specifies the default rights used by
# the local delivery agent for delivery to external file or command.
# These rights are used in the absence of a recipient user context.
# DO NOT SPECIFY A PRIVILEGED USER OR THE POSTFIX OWNER.
#
#default_privs = nobody
myhostname = mail.amazonnet.hu
mydomain = amazonnet.h
mydestination = $myhostname, localhost
unknown_local_recipient_reject_code = 550
mynetworks_style = host
mailbox_transport = lmtp:unix:/var/lib/imap/socket/lmtp
local_destination_recipient_limit = 300
local_destination_concurrency_limit = 5
recipient_delimiter=+
virtual_alias_maps = hash:/etc/postfix/virtual
header_checks = regexp:/etc/postfix/header_checks
mime_header_checks = pcre:/etc/postfix/body_checks
smtpd_banner = $myhostname
debug_peer_level = 2
debugger_command =
PATH=/bin:/usr/bin:/usr/bin:/usr/X11R6/bin
xxgdb $daemon_directory/$process_name $process_id & sleep 5
sendmail_path = /usr/sbin/sendmail.postfix
newaliases_path = /usr/bin/newaliases.postfix
mailq_path = /usr/bin/mailq.postfix
setgid_group = postdrop
html_directory = no
manpage_directory = /usr/share/man
sample_directory = /usr/share/doc/postfix-2.3.3/samples
readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES
smtpd_sasl_auth_enable = yes
smtpd_sasl_application_name = smtpd
smtpd_recipient_restrictions = permit_sasl_authenticated,
permit_mynetworks,
reject_unauth_destination,
reject_invalid_hostname,
reject_non_fqdn_hostname,
reject_non_fqdn_sender,
reject_non_fqdn_recipient,
reject_unknown_sender_domain,
reject_unknown_recipient_domain,
reject_unauth_pipelining,
reject_rbl_client zen.spamhaus.org,
reject_rbl_client bl.spamcop.net,
reject_rbl_client dnsbl.njabl.org,
reject_rbl_client dnsbl.sorbs.net,
permit
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain =
broken_sasl_auth_clients = yes
smtpd_helo_required = yes