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Full Discussion: I need help configuring postfix mail server within AWS
Operating Systems Linux Red Hat I need help configuring postfix mail server within AWS Post 302983834 by Padow1 on Monday 17th of October 2016 03:53:05 PM
Old 10-17-2016
Two things to check:

1) Did you configure postfix to listen on the correct IP in /etc/postfix/main.cf? inet_interfaces is probably the option you are looking for. you can see if postfix is listening with:
Code:
lsof -i :25

2) are you allowing inbound port 25 traffic in your ec2 security group?

Setting up a mail server is not easy. If you are interested in a guide to get all the necessary pieces set up, here is what I used. This guide is based on ubuntu, but I was able to get all of this working on a CentOS7 KVM instance that I then converted and is running in EC2. The only real bang-your-head-against-the-wall pieces with these instructions were getting clamav and spamassassin and their associated milters to work properly. Once that is all working, converting it to use mysql for passwords and accounts was fairly simple.
 

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LEARN ABOUT LINUX

postfix-add-filter

POSTFIX-ADD-FILTER(8)					      System Manager's Manual					     POSTFIX-ADD-FILTER(8)

NAME

       postfix-add-filter - add filter service to Postfix master.cf

SYNOPSIS

       postfix-add-filter [smtp service name...] [smtpd port...]

DESCRIPTION

       The  postfix-add-filter(8)  command  adds an smtp service named smtp service name and and smtpd server listening on smtpd port to etc/post-
       fix/master.cf to facilitate integration of SMTP filters such as amavisd-new or clamsmtp.  The configuration is based on the upstream recom-
       mendations for amavisd-new 2.6.0.  Adminstrators should verify it is appropriate for their requirements.

       The original file is copied prior to modification and left in /etc/postfix to make it possible to revert changes easily.

       Available in the Debian package for Postfix version 2.5.3 and later.

DIAGNOSTICS

       If  the given smtp service name or smtpd port already appear in the master.cf, a message will be printed to standard out and master.cf will
       not be modified.

ENVIRONMENT

       MAIL_CONFIG
	      Directory with Postfix configuration files.

	      The postfix-add-filter(8) command should use this, but it currently doesn't.  It is hard coded  to  /etc/postfix.   This	should	be
	      changed.

CONFIGURATION PARAMETERS

       None

FILES

       /etc/postfix/master.cf

SEE ALSO

       postconf(5), Postfix configuration

LICENSE

       This software is licensed under the MIT open source license.

AUTHOR(S)
       Scott Kitterman
       <scott@kitterman.com>

															     POSTFIX-ADD-FILTER(8)
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