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main.cf.doc (1 KB)

Firstly you need postfix compiled with SASL and ssl support.

Enter this command into your shell.


ldd /usr/lib/postfix/smtp


Here is the output:

linux-gate.so.1 => (0xffffe000)
libpostfix-master.so.1 => /usr/lib/libpostfix-master.so.1 (0xb7f43000)
libpostfix-tls.so.1 => /usr/lib/libpostfix-tls.so.1 (0xb7f38000)
libpostfix-dns.so.1 => /usr/lib/libpostfix-dns.so.1 (0xb7f33000)
libpostfix-global.so.1 => /usr/lib/libpostfix-global.so.1 (0xb7f0c000)
libpostfix-util.so.1 => /usr/lib/libpostfix-util.so.1 (0xb7ee6000)
libssl.so.0.9.8 => /usr/lib/i686/cmov/libssl.so.0.9.8 (0xb7ea9000)
libcrypto.so.0.9.8 => /usr/lib/i686/cmov/libcrypto.so.0.9.8 (0xb7d7b000) libsasl2.so.2 => /usr/lib/libsasl2.so.2 (0xb7d67000)
libdb-4.3.so => /usr/lib/libdb-4.3.so (0xb7c8a000)
libnsl.so.1 => /lib/tls/i686/cmov/libnsl.so.1 (0xb7c75000)
libresolv.so.2 => /lib/tls/i686/cmov/libresolv.so.2 (0xb7c62000)
libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xb7b33000)
libdl.so.2 => /lib/tls/i686/cmov/libdl.so.2 (0xb7b30000)
libz.so.1 => /usr/lib/libz.so.1 (0xb7b1b000)
/lib/ld-linux.so.2 (0xb7f59000)

If you dont see libssl and libsasl, this wont work, and you’ll need to recompile with support.

Generate a CSR for this server


openssl genrsa -out itchy.key 1024
openssl req -new -key itchy.key -out itchy.csr
openssl ca -out itchy.pem -infiles itchy.csr


Now include these main.cf modifications:

relayhost = [smtp.gmail.com]:587

#auth
smtp_sasl_auth_enable=yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd

#tls
smtp_use_tls = yes
smtp_sasl_security_options = noanonymous
smtp_sasl_tls_security_options = noanonymous
smtp_tls_note_starttls_offer = yes
tls_random_source = dev:/dev/urandom
smtp_tls_scert_verifydepth = 5
smtp_tls_key_file=/etc/postfix/certs/itchy.key
smtp_tls_cert_file=/etc/postfix/certs/itchy.pem
smtpd_tls_ask_ccert = yes
smtpd_tls_req_ccert =no
smtp_tls_enforce_peername = no

Create /etc/postfix/sasl_passwd file

This is the format of the sasl_passwd file.

Copy this text and edit with your account details then highlight and copy.

gmail-smtp.l.google.com user@gmail.com:password
smtp.gmail.com user@gmail.com:password

Enter these commands line by line and press enter after each line.


vim /etc/postfix/sasl_passwd
a
ctr + shift + v
esc
!wq
postmap /etc/postfix/sasl_passwd
/etc/init.d/postfix reload


That should work. Thanks to IMamba for original.

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