Hello,

I would recommend using an SMTP plugin like Easy WP SMTP. This would allow you to specify an SMTP server like Gmail, that way your Wordpress emails would be sent through Gmail’s SMTP server rather than just plain PHP mail.

This would also increase the delivery rate of your emails in general.

Hope that this helps!
Regards,
Bobby

@bobbyiliev

hi bobby,

what if we are hosting tens of wordpress sites for our clients on one of our droplets which we cannot log in to and install an wp smtp plugin?

we still need to fix the php mailer issue, dont we?

from the output of “nc -vz smtp.gmail.com 25”, we got “Connection to smtp.gmail.com 25 port [tcp/smtp] succeeded!” which means at least the droplet is able to communicate over the ports required to send emails externally.

from the output of “tail -20 /var/log/mail.log” below, we got some deferred emails sent from some of our clients. will those deferred emails prevent the droplet from sending other emails? any idea?

Dec 1 08:24:26 AzinityServerCPU2 postfix/smtp[22043]: 30067409CB: to=info@kennethchaucpa.com, relay=mail8.internad.hk[202.130.104.18]:25, delay=0.82, delays=0.02/0.01/0.21/0.58, dsn=2.6.0, status=sent (250 2.6.0 1048 bytes received in 00:00:00; Message id 201912011624254622 accepted for delivery)
Dec 1 08:24:26 AzinityServerCPU2 postfix/qmgr[1868]: 30067409CB: removed
Dec 1 08:26:03 AzinityServerCPU2 postfix/pickup[21887]: C9B23409CB: uid=33 from=<www-data>
Dec 1 08:26:03 AzinityServerCPU2 postfix/cleanup[22041]: C9B23409CB: message-id=86584e93c7b362c12461f14b930162b3@www.czdcpa.com
Dec 1 08:26:03 AzinityServerCPU2 postfix/qmgr[1868]: C9B23409CB: from=www-data@azinity.com, size=1031, nrcpt=1 (queue active)
Dec 1 08:26:24 AzinityServerCPU2 postfix/smtp[22043]: C9B23409CB: to=winnie@czdcpa.com, relay=mail.czdcpa.com[192.186.255.164]:25, delay=21, delays=0.01/0/21/0.19, dsn=5.0.0, status=bounced (host mail.czdcpa.com[192.186.255.164] said: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1) (in reply to MAIL FROM command))
Dec 1 08:26:24 AzinityServerCPU2 postfix/cleanup[22041]: F09AF409D9: message-id=20191201082624.F09AF409D9@AzinityServerCPU2
Dec 1 08:26:24 AzinityServerCPU2 postfix/qmgr[1868]: F09AF409D9: from=<>, size=2998, nrcpt=1 (queue active)
Dec 1 08:26:24 AzinityServerCPU2 postfix/bounce[22049]: C9B23409CB: sender non-delivery notification: F09AF409D9
Dec 1 08:26:24 AzinityServerCPU2 postfix/qmgr[1868]: C9B23409CB: removed
Dec 1 08:26:24 AzinityServerCPU2 postfix/local[22050]: F09AF409D9: to=www-data@azinity.com, relay=local, delay=0.01, delays=0/0.01/0/0, dsn=2.0.0, status=sent (delivered to maildir)
Dec 1 08:26:24 AzinityServerCPU2 postfix/qmgr[1868]: F09AF409D9: removed
Dec 1 08:26:55 AzinityServerCPU2 postfix/qmgr[1868]: 631CA409C8: from=www-data@azinity.com, size=1800, nrcpt=2 (queue active)
Dec 1 08:26:55 AzinityServerCPU2 postfix/smtp[22043]: 631CA409C8: host mx-apac.mail.gm0.yahoodns.net[106.10.248.74] said: 421 4.7.0 [TSS04] Messages from 139.59.96.33 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html (in reply to MAIL FROM command)
Dec 1 08:26:55 AzinityServerCPU2 postfix/smtp[22043]: 631CA409C8: lost connection with mx-apac.mail.gm0.yahoodns.net[106.10.248.74] while sending RCPT TO
Dec 1 08:26:55 AzinityServerCPU2 postfix/smtp[22043]: 631CA409C8: to=billionapex@yahoo.com.hk, relay=mx-apac.mail.gm0.yahoodns.net[106.10.248.73]:25, delay=143389, delays=143389/0/0.03/0.2, dsn=4.7.0, status=deferred (host mx-apac.mail.gm0.yahoodns.net[106.10.248.73] said: 421 4.7.0 [TSS04] Messages from 139.59.96.33 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html (in reply to MAIL FROM command))
Dec 1 08:56:54 AzinityServerCPU2 postfix/qmgr[1868]: 6EFF63F146: from=www-data@azinity.com, size=2413, nrcpt=2 (queue active)
Dec 1 08:56:54 AzinityServerCPU2 postfix/smtp[26774]: 6EFF63F146: host mx-apac.mail.gm0.yahoodns.net[106.10.248.74] said: 421 4.7.0 [TSS04] Messages from 139.59.96.33 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html (in reply to MAIL FROM command)
Dec 1 08:56:54 AzinityServerCPU2 postfix/smtp[26774]: 6EFF63F146: lost connection with mx-apac.mail.gm0.yahoodns.net[106.10.248.74] while sending RCPT TO
Dec 1 08:56:56 AzinityServerCPU2 postfix/smtp[26774]: 6EFF63F146: to=billionapex@yahoo.com.hk, relay=mx-apac.mail.gm0.yahoodns.net[106.10.248.73]:25, delay=214684, delays=214682/0.04/1.6/0, dsn=4.7.0, status=deferred (host mx-apac.mail.gm0.yahoodns.net[106.10.248.73] said: 421 4.7.0 [TSS04] Messages from 139.59.96.33 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html (in reply to MAIL FROM command))

br,
tom