Automatic email relay agent?

John Gallagher john.gallagher at ciosystems.com
Fri Dec 2 02:53:31 UTC 2005


>Message: 3
>Date: Thu, 1 Dec 2005 16:07:36 -0600 (CST)
>From: "Hongwei Li" <hongwei at wustl.edu>


>The Symantec Antivirus checks port 25 for outgoing emails.  So, if we could
set port 587 for SMTP on the server side, then it may work with Symantec 
>antivirus.  Is it true?  If yes, how to set the port 587 on the server side
for SMTP?  Will that work anyway?

>Thanks!

>Hongwei

By default it will set up SMTP using TLS on port 465.  What SBC yahoo has
published in the post above is irrelevant and I have used this with all of
the Symantec products. Also,  I can send you a detailed doc on integrating
spam filters, ClamAV and also exporting the self signed keys that are
generated below and importing them into Outlook for both Postfix and dovecot
IMAP.  If you want them email me off line and I will send them along.

Good Luck,

John
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
cat /etc/services |grep smtp
smtp            25/tcp          mail
smtp            25/udp          mail
smtps           465/tcp                         # SMTP over SSL (TLS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Generate the certificate files needed for TLS Fedora Postfix implementation:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
mkdir /etc/postfix/certs
cd /etc/postfix/certs/


openssl genrsa -des3 -rand /etc/hosts -out smtpd.key 1024

<- Enter a password for smtpd.key. (something)

chmod 600 smtpd.key
openssl req -new -key smtpd.key -out smtpd.csr

<- Again, enter your password for smtpd.key.
Something
<- Enter your Country Name (e.g., "DE").
US
<- Enter your State or Province Name.
California	
<- Enter your City.
Felton
<- Enter your Organization Name (e.g., the name of your company).
Your Name
<- Enter your Organizational Unit Name (e.g. "IT Department").
Nothing
<- Enter the Fully Qualified Domain Name of the system (e.g.
"server1.example.com").		systemname.domainname.com
<- Enter your Email Address.
your-email at someplace.com


The following information is optional:

<- Enter a challenge password.
Not Entered
<- Enter an optional company name.
Not Entered

openssl x509 -req -days 9999 -in smtpd.csr -signkey smtpd.key -out smtpd.crt

<- Again, enter your password for smtpd.key.


openssl rsa -in smtpd.key -out smtpd.key.unencrypted

<- Again, enter your password for smtpd.key.


mv -f smtpd.key.unencrypted smtpd.key
openssl req -new -x509 -extensions v3_ca -keyout cakey.pem -out cacert.pem
-days 9999

<- Again, enter your password for smtpd.key.
Something
<- Enter your Country Name (e.g., "DE").
US
<- Enter your State or Province Name.
California
<- Enter your City.
Felton
<- Enter your Organization Name (e.g., the name of your company).
Your Name
<- Enter your Organizational Unit Name (e.g. "IT Department").
Nothing
<- Enter the Fully Qualified Domain Name of the system (e.g.
"server1.example.com").		systemname.domainname.com
<- Enter your Email Address.
your-email at someplace.com

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 
Modify /etc/postfix/main.cf adding the following lines:
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

#smtpd_recipient_restrictions=permit_sasl_authenticated,permit_mynetworks,ch
eck_relay_domains
smtpd_tls_auth_only = no
smtp_use_tls = yes
smtpd_use_tls = yes
smtp_tls_note_starttls_offer = yes
smtpd_tls_key_file = /etc/postfix/certs/smtpd.key
smtpd_tls_cert_file = /etc/postfix/certs/smtpd.crt
smtpd_tls_CAfile = /etc/postfix/certs/cacert.pem
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Uncomment TLS and SASL lines in /etc/postfix/master.cf
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#DO NOT SHARE THE POSTFIX QUEUE BETWEEN MULTIPLE POSTFIX INSTANCES.
#
# ==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (yes)   (never) (100)
# ==========================================================================
smtp      inet  n       -       n       -       -       smtpd
smtps     inet  n       -       n       -       -       smtpd
  -o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes
submission      inet    n       -       n       -       -       smtpd
#Default
  -o smtpd_enforce_tls=yes -o smtpd_sasl_auth_enable=yes
#628      inet  n       -       n       -       -       qmqpd
pickup    fifo  n       -       n       60      1       pickup
cleanup   unix  n       -       n       -       0       cleanup
#qmgr      fifo  n       -       n       300     1       qmgr
qmgr     fifo  n       -       n       300     1       nqmgr
tlsmgr    fifo  -       -       n       300     1       tlsmgr
rewrite   unix  -       -       n       -       -       trivial-rewrite
bounce    unix  -       -       n       -       0       bounce
defer     unix  -       -       n       -       0       bounce
flush     unix  n       -       n       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
smtp      unix  -       -       n       -       -       smtp
relay     unix  -       -       n       -       -       smtp
#       -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
showq     unix  n       -       n       -       -       showq
error     unix  -       -       n       -       -       error
local     unix  -       n       n       -       -       local
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       n       -       -       lmtp
#
# Interfaces to non-Postfix software. Be sure to examine the manual
# pages of the non-Postfix software to find out what options it wants.
#
# maildrop. See the Postfix MAILDROP_README file for details.
#
maildrop  unix  -       n       n       -       -       pipe
  flags=DRhu user=vmail argv=/usr/local/bin/maildrop -d ${recipient}
#
# The Cyrus deliver program has changed incompatibly, multiple times.
#
old-cyrus unix  -       n       n       -       -       pipe
  flags=R user=cyrus argv=/cyrus/bin/deliver -e -m ${extension} ${user}
# Cyrus 2.1.5 (Amos Gouaux)
cyrus     unix  -       n       n       -       -       pipe
  user=cyrus argv=/cyrus/bin/deliver -e -r ${sender} -m ${extension} ${user}
uucp      unix  -       n       n       -       -       pipe
  flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail
($recipient)
ifmail    unix  -       n       n       -       -       pipe
  flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp     unix  -       n       n       -       -       pipe
  flags=Fq. user=foo argv=/usr/local/sbin/bsmtp -f $sender $nexthop
$recipient

++++++++++++++++++++++++++++++++++++++++++++++++++++++++

#Service postfix restart




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