I am unable to get email functioning in WP 4.8.
I have WordPress running on a Bitnami LAMP stack. All modules/plugins/themes/languages are up to date.
I have an SMTP host that is effectively an open relay (coming from my network only) and so does not require or support authentication. I want to use this to deliver all SMTP from WordPress.
WordPress has the plugin WP-Mail-SMTP which allows basic email config and test. Using this plugin I have tried a combination of all the possible settings, all of which fail.
My ideal (I believe) setup would be:
Send All WordPress email via SMTP
SMTP Host : mailgateway.com.outbound.epasecure.com
SMTP Port : 25
Encryption : No Encryption
Authentication : No: Do notuse SMTP authentication
The log output demonstrates the issue I am having is like this [Note : IP.AD.DRE.SS is a sanitized version of my WAN IP]
The SMTP debugging output is shown below:
2017-10-09 14:43:40 Connection: opening to mailgateway.com.outbound.epasecure.com:25, timeout=300, options=array (
)
2017-10-09 14:43:41 Connection: opened
2017-10-09 14:43:41 SMTP -> get_lines(): $data is ""
2017-10-09 14:43:41 SMTP -> get_lines(): $str is "220 out4d.electric.net ESMTP"
2017-10-09 14:43:41 SERVER -> CLIENT: 220 out4d.electric.net ESMTP
2017-10-09 14:43:41 CLIENT -> SERVER: EHLO 192.168.50.94
2017-10-09 14:43:41 SMTP -> get_lines(): $data is ""
2017-10-09 14:43:41 SMTP -> get_lines(): $str is "250-out4d.electric.net Hello 192.168.50.94 [IP.AD.DRE.SS]"
2017-10-09 14:43:41 SMTP -> get_lines(): $data is "250-out4d.electric.net Hello 192.168.50.94 [IP.AD.DRE.SS]"
2017-10-09 14:43:41 SMTP -> get_lines(): $str is "250-SIZE 268435456"
2017-10-09 14:43:41 SMTP -> get_lines(): $data is "250-out4d.electric.net Hello 192.168.50.94 [IP.AD.DRE.SS]"
250-SIZE 268435456
2017-10-09 14:43:41 SMTP -> get_lines(): $str is "250-8BITMIME"
2017-10-09 14:43:41 SMTP -> get_lines(): $data is "250-out4d.electric.net Hello 192.168.50.94 [IP.AD.DRE.SS]"
250-SIZE 268435456
250-8BITMIME
2017-10-09 14:43:41 SMTP -> get_lines(): $str is "250-PIPELINING"
2017-10-09 14:43:41 SMTP -> get_lines(): $data is "250-out4d.electric.net Hello 192.168.50.94 [IP.AD.DRE.SS]"
250-SIZE 268435456
250-8BITMIME
250-PIPELINING
2017-10-09 14:43:41 SMTP -> get_lines(): $str is "250-AUTH LOGIN"
2017-10-09 14:43:41 SMTP -> get_lines(): $data is "250-out4d.electric.net Hello 192.168.50.94 [IP.AD.DRE.SS]"
250-SIZE 268435456
250-8BITMIME
250-PIPELINING
250-AUTH LOGIN
2017-10-09 14:43:41 SMTP -> get_lines(): $str is "250-STARTTLS"
2017-10-09 14:43:41 SMTP -> get_lines(): $data is "250-out4d.electric.net Hello 192.168.50.94 [IP.AD.DRE.SS]
250-SIZE 268435456
250-8BITMIME
250-PIPELINING
250-AUTH LOGIN
250-STARTTLS
2017-10-09 14:43:41 SMTP -> get_lines(): $str is "250 HELP"
2017-10-09 14:43:41 SERVER -> CLIENT: 250-out4d.electric.net Hello 192.168.50.94 [IP.AD.DRE.SS]
250-SIZE 268435456
250-8BITMIME
250-PIPELINING
250-AUTH LOGIN
250-STARTTLS
250 HELP
2017-10-09 14:43:41 CLIENT -> SERVER: STARTTLS
2017-10-09 14:43:41 SMTP -> get_lines(): $data is ""
2017-10-09 14:43:41 SMTP -> get_lines(): $str is "220 TLS go ahead
2017-10-09 14:43:41 SERVER -> CLIENT: 220 TLS go ahead
2017-10-09 14:43:41 SMTP Error: Could not connect to SMTP host.
2017-10-09 14:43:41 CLIENT -> SERVER: QUIT
2017-10-09 14:43:41 SMTP -> get_lines(): $data is ""
2017-10-09 14:43:41 SMTP -> get_lines(): $str is "221 out4d.electric.net closing connection"
2017-10-09 14:43:41 SERVER -> CLIENT: 221 out4d.electric.net closing connection
2017-10-09 14:43:41 Connection: closed
2017-10-09 14:43:41 SMTP Error: Could not connect to SMTP host.
The crucial element here is as follows :
2017-10-09 14:43:41 CLIENT -> SERVER: STARTTLS
2017-10-09 14:43:41 SERVER -> CLIENT: 220 TLS go ahead
2017-10-09 14:43:41 CLIENT -> SERVER: QUIT
The client is negotiating TLS despite the WP-Mail-SMTP config being set to not do so, and the relay I am sending via not requiring TLS to connect.
If I SSH to the WordPress server and TELNET to the SMTP relay I can do a manual email as follows:
>telnet mailgateway.com.outbound.epasecure.com 25
EHLO example.com
MAIL FROM:[email protected]
RCPT TO:[email protected]
DATA
TEST
.
This sends as expected.
As work-arounds I have tried to get this working with both sSMTP and most recently Postfix installed on the WordPress host.
I have configured Postfix as an open relay and telnet localhost 25 works and allows me to send mail via my normal relay.
When configuring WordPress to send via localhost:25 I get the same failure, the Client negotiates TLS, the server responds and the client quits.
I would like to prevent the client from offering TLS. How do I configure WordPress to do this.
