Hello team i tried to send mail out by connect to my gmail and php mail function, but it seem likes not working, your server deny send mail out? or i wrong some config information on my server? this is the log i send mail out by php mail function My unqualified host name (centos-512mb-sgp1-01) unknown; sleeping for retry this is the log send by phpmailler(the php library send mail via smtp) Jan 24 18:22:19 centos-512mb-sgp1-01 postfix/qmgr[29831]: 442CE41923: from=apache@centos-512mb-sgp1-01.localdomain, size=1431, nrcpt=1 (queue active) Jan 24 18:22:19 centos-512mb-sgp1-01 postfix/qmgr[29831]: 45F3B3F256: from=root@centos-512mb-sgp1-01.localdomain, size=604, nrcpt=1 (queue active) Jan 24 18:22:19 centos-512mb-sgp1-01 postfix/qmgr[29831]: A2B44403C9: from=root@centos-512mb-sgp1-01.localdomain, size=542, nrcpt=1 (queue active) Jan 24 18:22:19 centos-512mb-sgp1-01 postfix/error[30105]: 45F3B3F256: to=ngodanghuuha@gmail.com, relay=none, delay=1072, delays=1072/0.01/0/0.01, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to alt2.gmail-smtp-in.l.google.com[2607:f8b0:4003:c09::1b]:25: Connection timed out) Jan 24 18:22:19 centos-512mb-sgp1-01 postfix/error[30106]: A2B44403C9: to=ngodanghuuha@gmail.com, relay=none, delay=471, delays=471/0.02/0/0, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to alt2.gmail-smtp-in.l.google.com[2607:f8b0:4003:c09::1b]:25: Connection timed out)
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Configure a fully qualified domain name for your hostname. Something like server.example.com then give the hostname the IP of the droplet in the DNS management system for your domain. Make sure to set this hostname in your DO control panel too (so the reverse DNS for your DO IP resolves properly). You’ll then need to set SPF records so this server is authorized to send email on behalf of your domain. There are more things to do to ensure proper mail delivery. But this is a good start.
Cheers
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