One stupid thing to remember: if u send the mail from gmail via your postfix to gmail, then google ignores that. So you need to test that by not using a gmail address.

this one <br>https://digitalocean.com/community/articles/how-to-set-up-a-postfix-e-mail-server-with-dovecot <br> <br>

<b>“I followed the tutorial for installing postfix…”</b> <br> <br>Which one?

Thanks loads, that seems to have fixed that problem at least. Postfix starts up now and I don’'t get the unreachable network error. <br>However i’m still not able to send some mail. My log is below and ooutput from postconf -n, the first mail arrives (and used to work even when ipv6 was enabled) but the second email never arrives (i can send to the email address from elsewhere). <br>Any ideas on how i can start to debug this? <br> <br>Jan 3 11:48:19 localhost postfix/submission/smtpd[31158]: connect from unknown[198.199.124.252] <br>Jan 3 11:48:19 localhost postfix/submission/smtpd[31158]: 686B842ABD: client=unknown[198.199.124.252], sasl_method=PLAIN, sasl_username=admin <br>Jan 3 11:48:19 localhost postfix/cleanup[31165]: 686B842ABD: message-id=52c6a382f25b5_39641869f1020266@behappyhost.mail <br>Jan 3 11:48:19 localhost postfix/qmgr[31146]: 686B842ABD: from=please-change-me-at-config-initializers-devise@example.com, size=1159, nrcpt=1 (queue active) <br>Jan 3 11:48:19 localhost postfix/submission/smtpd[31158]: disconnect from unknown[198.199.124.252] <br>Jan 3 11:48:19 localhost postfix/smtp[31166]: 686B842ABD: to=kimberley.bottomley@virginmedia.com, relay=aspmx.l.google.com[173.194.70.27]:25, delay=0.51, delays=0.04/0.01/0.17/0.29, dsn=2.0.0, status=sent (250 2.0.0 OK 1388749699 v6si70477773eel.7 - gsmtp) <br> <br>log of an email that never arrives <br>Jan 3 11:48:19 localhost postfix/submission/smtpd[31158]: connect from unknown[198.199.124.252] <br>Jan 3 11:48:19 localhost postfix/submission/smtpd[31158]: 686B842ABD: client=unknown[198.199.124.252], sasl_method=PLAIN, sasl_username=admin <br>Jan 3 11:48:19 localhost postfix/cleanup[31165]: 686B842ABD: message-id=52c6a382f25b5_39641869f1020266@behappyhost.mail <br>Jan 3 11:48:19 localhost postfix/qmgr[31146]: 686B842ABD: from=please-change-me-at-config-initializers-devise@example.com, size=1159, nrcpt=1 (queue active) <br>Jan 3 11:48:19 localhost postfix/submission/smtpd[31158]: disconnect from unknown[198.199.124.252] <br>Jan 3 11:48:19 localhost postfix/smtp[31166]: 686B842ABD: to=kimberley.bottomley@virginmedia.com, relay=aspmx.l.google.com[173.194.70.27]:25, delay=0.51, delays=0.04/0.01/0.17/0.29, dsn=2.0.0, status=sent (250 2.0.0 OK 1388749699 v6si70477773eel.7 - gsmtp) <br> <br> <br>log on an email that arrives <br>Jan 3 11:49:26 localhost postfix/submission/smtpd[31158]: connect from unknown[198.199.124.252] <br>Jan 3 11:49:26 localhost postfix/submission/smtpd[31158]: 084A342ABD: client=unknown[198.199.124.252], sasl_method=PLAIN, sasl_username=admin <br>Jan 3 11:49:26 localhost postfix/cleanup[31165]: 084A342ABD: message-id=52c6a3c5ebd77_39641869f102033a@behappyhost.mail <br>Jan 3 11:49:26 localhost postfix/qmgr[31146]: 084A342ABD: from=please-change-me-at-config-initializers-devise@example.com, size=1141, nrcpt=1 (queue active) <br>Jan 3 11:49:26 localhost postfix/submission/smtpd[31158]: disconnect from unknown[198.199.124.252] <br>Jan 3 11:49:26 localhost postfix/smtp[31166]: 084A342ABD: to=roy.bottomley@virginmedia.com, relay=aspmx.l.google.com[173.194.70.27]:25, delay=0.5, delays=0.04/0/0.2/0.26, dsn=2.0.0, status=sent (250 2.0.0 OK 1388749766 t6si70482011eeh.45 - gsmtp) <br>Jan 3 11:49:26 localhost postfix/qmgr[31146]: 084A342ABD: removed <br> <br>postconf -n output <br>alias_database = hash:/etc/aliases <br>alias_maps = hash:/etc/aliases <br>config_directory = /etc/postfix <br>inet_interfaces = all <br>inet_protocols = ipv4 <br>local_recipient_maps = proxy:unix:passwd.byname $alias_maps <br>mailbox_size_limit = 0 <br>mydestination = mail.traintobehappy.com, traintobehappy.com, localhost, localhost.localdomain <br>myhostname = mail.traintobehappy.com <br>mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 <br>myorigin = /etc/mailname <br>recipient_delimiter = + <br>relayhost = <br>smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache <br>smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination <br>smtpd_tls_cert_file = /etc/ssl/private/mail.traintobehappy.crt <br>smtpd_tls_key_file = /etc/ssl/private/mail.key <br>smtpd_tls_protocols = !SSLv2, !SSLv3 <br>smtpd_tls_security_level = may <br>smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache <br>smtpd_use_tls = yes <br> <br>

Change inet_interfaces back to all <br> <br>add this in the postfix config: <br>inet_protocols = ipv4 <br> <br>then try restarting