Question

Problem with Email server (Postfix error)

Posted July 25, 2013 12.7k views
Hello. I tried to install posfix on my server to send and receive email. There were some problems with gmail messages getting into spam folder. I put MX and TXT records in DNS + installed SPF on server. Now i can send email with postfix ( dont know how, but after this no messages in spam folders) but still could not receive any ( for ex. from @gmail acc to my web@site.net) sudo mail says - no new messages + this is from maillog file postfix/smtpd[3316]: fatal: need service transport:endpoint instead of "check_policy_service" postfix/master[3313]: warning: process /usr/libexec/postfix/smtpd pid 3316 exit status 1 postfix/master[3313]: warning: /usr/libexec/postfix/smtpd: bad command startup -- throttling Here if my full main.cf file: queue_directory = /var/spool/postfix command_directory = /usr/sbin daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix mail_owner = postfix inet_interfaces = all inet_protocols = all mydestination = $myhostname, localhost.$mydomain, localhost unknown_local_recipient_reject_code = 550 alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases debug_peer_level = 2 debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$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-2.6.6/samples readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES myhostname = site.net mydomain = site.net smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination, check_policy_service,check_policy_service unix:private/policy-spf policy_time_limit = 3600 I dont know why he didnt like this line: smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination, check_policy_service,check_policy_service unix:private/policy-spf This is from SPF install FAQ + What i should do to make good Web-mail server for my users? Sorry for my English :) Thanks.
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throughthesky
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throughthesky

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8 answers
pablo July 25, 2013
First check your firewall settings, and ensure that both inbound and outbound traffic is allowed on port 25. If you are still getting the error message, then open up /etc/postfix/main.cf and look for the following line:
inet_interfaces = localhost



and make sure it's commented out.
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throughthesky July 25, 2013
This line should be inet_interfaces = localhost?
I have -
inet_interfaces = all
and how to check firewall settings with allowed traffic on 25 port?
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pablo July 25, 2013
"This line should be inet_interfaces = localhost?"
No, it should be commented out.

"how to check firewall settings with allowed traffic on 25 port?"
Check out How to Setup a Firewall with UFW on an Ubuntu and Debian Cloud Server
How To Setup a Firewall with UFW on an Ubuntu and Debian Cloud Server
by Shaun Lewis
Learn how to setup a firewall with UFW on an Ubuntu / Debian cloud server.
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throughthesky July 25, 2013
"how to check firewall settings with allowed traffic on 25 port?"
From info:
DigitalOcean droplets usually come with the empty configuration: all traffic is allowed.
"No, it should be commented out."
I already commented out this lane with "inet_interfaces = all" in it
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kamaln7 July 26, 2013
I see that port 25 is open on your droplet, try sending an email again. Does it work now?
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throughthesky July 26, 2013
Yes. It seems that 25 is closed.
How i can open 25 and all other POP3 and IMAP ports on CentOS?
Only with iptables? What should i write there?
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kamaln7 July 26, 2013
Port 25 is not closed - I can access it: 

telnet yourdroplet'sIPaddress 25


I was able to connect successfully. Try sending an email again, does it bounce back? (you'll get a delivery failed email if it did).

Check /var/log/mail.err for errors. Do you find anything?
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throughthesky July 26, 2013
Yes. I got bounced message:
The recipient server did not accept our requests to connect. Learn more at http://support.google.com/mail/bin/answer.py?answer=7720
[(0) site.com. [xx.xx.xx.xx]:25: Connection timed out]
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