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Is google apps sending the email, or my server?
https://forum.linode.com/viewtopic.php?f=11&t=5628		 Page 1 of 1
Author:  minustwo [ Wed May 26, 2010 5:46 pm ]
Post subject:  Is google apps sending the email, or my server?
I installed postfix on my vps, but only postfix...
no fancy stuff like Courier as the guide says:

http://library.linode.com/email/postfix ... .10-karmic

I have my domain name's mx records setup for google apps:

ASPMX.L.GOOGLE.COM
ALT1.ASPMX.L.GOOGLE.COM
etc....

The only info I gave postfix was my domain name.

I set the mail_path in php.ini
sendmail_path = "/usr/sbin/sendmail -t -i"

I tested the php mail() function and it works.

Here is my question:

My mail.log file shows:

Code:
May 25 22:52:44 [i]servername[/i] postfix/smtp[3223]: 07302A1C6: to=<test34322@yahoo.com>, relay=ASPMX.L.GOOGLE.COM[74.125.157.27]:25, delay=4.4, delays=0.02/0.01/3.7/0.67, dsn=2.0.0, status=sent (250 2.0.0 OK 1274842364 v21si662812ybk.37)


Is this going out from google's smtp server? My concern is that I do not want to hit there 500 email / day limit. I am guessing postfix talks to my domain name, then my domain name's mx is set to google, so google's smtp is used, and I am limited by google's email limit.


Thanks for any insight!
Author:  arjones85 [ Fri May 28, 2010 1:19 pm ]
Post subject: 
It's not possible for your server to be using Google's SMTP servers to send mail unless you have some custom SMTP authentication setup in Postfix.


With that said, I have no clue why it's contacting Google's SMTP servers to send a message to a Yahoo address. Can you post your main.cf and master.cf file?
Author:  minustwo [ Fri May 28, 2010 5:55 pm ]
Post subject: 
Thanks for the reply.

I have never manually set anything to use google's smtp. The place I added options to talk with google would be through my domain's mx settings.

I guess I do not understand what the MX records do, so I don't know if using them limits me to google's 500 email / day limit.

Quote:
With that said, I have no clue why it's contacting Google's SMTP servers to send a message to a Yahoo address. Can you post your main.cf and master.cf file?


Maybe my server is using postfix as smtp, and the mail log was showing my google MX record?

Code:
postfix/smtp[3223]

Code:
relay=ASPMX.L.GOOGLE.COM[74.125.157.27]:25



My main.cf and master.cf should be really close to default:

main.cf:

Code:
# 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 = mail.mysite.com
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = mail.mysite.com, localhost, localhost.localdomain, localhost
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all



master.cf:
Code:
#old-cyrus unix  -       n       n       -       -       pipe
#  flags=R user=cyrus argv=/cyrus/bin/deliver -e -m ${extension} ${user}
#
# ====================================================================
#
# See the Postfix UUCP_README file for configuration details.
#
uucp      unix  -       n       n       -       -       pipe
  flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
#
# Other external delivery methods.
#
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=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient
scalemail-backend unix  -       n       n       -       2       pipe
  flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}
mailman   unix  -       n       n       -       -       pipe
  flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
  ${nexthop} ${user}
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