postfix

thufir@dur:~$
thufir@dur:~$ dig dur.bounceme.net mx

; <<>> DiG 9.9.3-rpz2+rl.13214.22-P2-Ubuntu-1:9.9.3.dfsg.P2-4ubuntu1 <<>> dur.bounceme.net mx
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4088
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;dur.bounceme.net.		IN	MX

;; ANSWER SECTION:
dur.bounceme.net.	1800	IN	MX	5 dur.bounceme.net.

;; Query time: 1575 msec
;; SERVER: 127.0.1.1#53(127.0.1.1)
;; WHEN: Mon Dec 30 18:00:00 PST 2013
;; MSG SIZE  rcvd: 50

thufir@dur:~$ nslookup -query=mx dur.bounceme.net
Server:		127.0.1.1
Address:	127.0.1.1#53

Non-authoritative answer:
dur.bounceme.net	mail exchanger = 5 dur.bounceme.net.

Authoritative answers can be found from:

thufir@dur:~$
thufir@dur:~$ nslookup dur.bounceme.net
Server:		127.0.1.1
Address:	127.0.1.1#53

Non-authoritative answer:
Name:	dur.bounceme.net
Address: 96.55.205.166

thufir@dur:~$
thufir@dur:~$ dig dur.bounceme.net

; <<>> DiG 9.9.3-rpz2+rl.13214.22-P2-Ubuntu-1:9.9.3.dfsg.P2-4ubuntu1 <<>> dur.bounceme.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63216
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;dur.bounceme.net.		IN	A

;; ANSWER SECTION:
dur.bounceme.net.	16	IN	A	96.55.205.166

;; Query time: 14 msec
;; SERVER: 127.0.1.1#53(127.0.1.1)
;; WHEN: Mon Dec 30 18:00:43 PST 2013
;; MSG SIZE  rcvd: 50

thufir@dur:~$
thufir@dur:~$ postconf -n
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
broken_sasl_auth_clients = yes
config_directory = /etc/postfix
home_mailbox = Maildir/
inet_interfaces = all
mailbox_command = /usr/lib/dovecot/deliver -c /etc/dovecot/dovecot.conf -m "${EXTENSION}"
mailbox_size_limit = 0
mydestination = dur.bounceme.net, localhost.bounceme.net, , localhost
myhostname = dur.bounceme.net
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
myorigin = /etc/mailname
readme_directory = no
recipient_delimiter = +
relayhost =
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtp_use_tls = yes
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
smtpd_recipient_restrictions = reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_authenticated_header = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_path = private/dovecot-auth
smtpd_sasl_security_options = noanonymous
smtpd_sasl_type = dovecot
smtpd_sender_restrictions = reject_unknown_sender_domain
smtpd_tls_auth_only = yes
smtpd_tls_cert_file = /etc/dovecot/dovecot.pem
smtpd_tls_key_file = /etc/dovecot/private/dovecot.pem
smtpd_tls_mandatory_ciphers = medium
smtpd_tls_mandatory_protocols = SSLv3, TLSv1
smtpd_tls_received_header = yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_use_tls = yes
tls_random_source = dev:/dev/urandom
thufir@dur:~$