Email not sending SMTP connect() failed (SMTP debug report inside)

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1

I am using latest version of phplist
using php 7.4

I have made settings as below in my config.php…

define("PHPMAILER",1);
define("PHPMAILERHOST", 'smtp-relay.brevo.com');
define("PHPMAILERPORT",587);
define('PHPMAILER_SECURE',tls);
$phpmailer_smtpuser = 'xyz@gmail.com';
$phpmailer_smtppassword = '****';
define('PHPMAILER_SMTP_DEBUG', 4);
define('SMTP_TIMEOUT',30);

But it is not sending emails using brevo smtp. Emails are being sent when i use my own hosting provider’s smtp, but email lands in spam box. So, i decided to use smtp from brevo. [The only reason i am using brevo is to land email in inbox. My hosting provider’s has all the email deliverability options enabled but email still lands in spam box]

I have followed this thread also Not sending email through external smtp server - #2 by duncanc without any success.

Below is the smtp debug…

2023-08-29 13:53:34 Connection: opening to smtp-relay.brevo.com:587, timeout=30, options=array ( 'ssl' => array ( 'verify_peer' => false, 'verify_peer_name' => false, 'allow_self_signed' => true, ),)
2023-08-29 13:53:34 Connection: opened
2023-08-29 13:53:34 SMTP INBOUND: "220-ssd.lncloud.in ESMTP Exim 4.95 #2 Tue, 29 Aug 2023 13:53:34 +0000"
2023-08-29 13:53:34 SMTP INBOUND: "220-We do not authorize the use of this system to transport unsolicited,"
2023-08-29 13:53:34 SMTP INBOUND: "220 and/or bulk e-mail."
2023-08-29 13:53:34 SERVER -> CLIENT: 220-ssd.lncloud.in ESMTP Exim 4.95 #2 Tue, 29 Aug 2023 13:53:34 +0000 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail.
2023-08-29 13:53:34 CLIENT -> SERVER: EHLO nirdosh.shop
2023-08-29 13:53:34 SMTP INBOUND: "250-ssd.lncloud.in Hello nirdosh.shop [172.26.9.99]"
2023-08-29 13:53:34 SMTP INBOUND: "250-SIZE 52428800"
2023-08-29 13:53:34 SMTP INBOUND: "250-8BITMIME"
2023-08-29 13:53:34 SMTP INBOUND: "250-PIPELINING"
2023-08-29 13:53:34 SMTP INBOUND: "250-PIPE_CONNECT"
2023-08-29 13:53:34 SMTP INBOUND: "250-AUTH PLAIN LOGIN"
2023-08-29 13:53:34 SMTP INBOUND: "250-STARTTLS"
2023-08-29 13:53:34 SMTP INBOUND: "250 HELP"
2023-08-29 13:53:34 SERVER -> CLIENT: 250-ssd.lncloud.in Hello nirdosh.shop [172.26.9.99]250-SIZE 52428800250-8BITMIME250-PIPELINING250-PIPE_CONNECT250-AUTH PLAIN LOGIN250-STARTTLS250 HELP
2023-08-29 13:53:34 CLIENT -> SERVER: STARTTLS
2023-08-29 13:53:34 SMTP INBOUND: "220 TLS go ahead"
2023-08-29 13:53:34 SERVER -> CLIENT: 220 TLS go ahead
2023-08-29 13:53:34 CLIENT -> SERVER: EHLO nirdosh.shop
2023-08-29 13:53:34 SMTP INBOUND: "250-ssd.lncloud.in Hello nirdosh.shop [172.26.9.99]"
2023-08-29 13:53:34 SMTP INBOUND: "250-SIZE 52428800"
2023-08-29 13:53:34 SMTP INBOUND: "250-8BITMIME"
2023-08-29 13:53:34 SMTP INBOUND: "250-PIPELINING"
2023-08-29 13:53:34 SMTP INBOUND: "250-PIPE_CONNECT"
2023-08-29 13:53:34 SMTP INBOUND: "250-AUTH PLAIN LOGIN"
2023-08-29 13:53:34 SMTP INBOUND: "250 HELP"
2023-08-29 13:53:34 SERVER -> CLIENT: 250-ssd.lncloud.in Hello nirdosh.shop [172.26.9.99]250-SIZE 52428800250-8BITMIME250-PIPELINING250-PIPE_CONNECT250-AUTH PLAIN LOGIN250 HELP
2023-08-29 13:53:34 Auth method requested: UNSPECIFIED
2023-08-29 13:53:34 Auth methods available on the server: PLAIN,LOGIN
2023-08-29 13:53:34 Requested auth method not available:
2023-08-29 13:53:34 Auth method selected: LOGIN
2023-08-29 13:53:34 CLIENT -> SERVER: AUTH LOGIN
2023-08-29 13:53:34 SMTP INBOUND: "334 VXNlcm5hbWU6"
2023-08-29 13:53:34 SERVER -> CLIENT: 334 VXNlcm5hbWU6
2023-08-29 13:53:34 CLIENT -> SERVER: bWlsYW4yMnBhcm1hckBnbWFpbC5jb20=
2023-08-29 13:53:34 SMTP INBOUND: "334 UGFzc3dvcmQ6"
2023-08-29 13:53:34 SERVER -> CLIENT: 334 UGFzc3dvcmQ6
2023-08-29 13:53:34 CLIENT -> SERVER: Z0VuTGprVndwUE9ZMlJEUQ==
2023-08-29 13:53:36 SMTP INBOUND: "535 Incorrect authentication data"
2023-08-29 13:53:36 SERVER -> CLIENT: 535 Incorrect authentication data
2023-08-29 13:53:36 SMTP ERROR: Password command failed: 535 Incorrect authentication data
SMTP Error: Could not authenticate.
2023-08-29 13:53:36 CLIENT -> SERVER: QUIT
2023-08-29 13:53:36 SMTP INBOUND: "221 ssd.lncloud.in closing connection"
2023-08-29 13:53:36 SERVER -> CLIENT: 221 ssd.lncloud.in closing connection
2023-08-29 13:53:36 Connection: closed
SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
2

@kempemor
There appears to be something wrong with the user or password

023-08-29 13:53:36 SMTP ERROR: Password command failed: 535 Incorrect authentication data
SMTP Error: Could not authenticate.
3

Ok Sir. Thanks for the prompt reply. I have checked the same authentication credentials (user name and password) at various SMTP checker tools available online e.g. one of tools was of Domaintools.com. And all the tools did send the email using the same auth credentials.

I have raised a ticket with brevo with SMTP debug log.

And will also raise the point you have pointed out at.

Will post update.

Thanks

4

Hello @duncanc how come other tools are able to send email by using the same server? SMTP Test Tool That tool is able to send email.

5

@kempemor You appear to be connecting to a different SMTP server ssd.lncloud.in . Is that to do with your hosting company?

When I try your credentials they work but I am connecting to brevo.com

2023-08-30 06:01:04 Connection: opening to smtp-relay.brevo.com:587, timeout=30, options=array()
2023-08-30 06:01:04 Connection: opened
2023-08-30 06:01:04 SMTP INBOUND: “220 smtp-relay.brevo.com ESMTP Service Ready”

this line in config.php is incorrect, tls needs to be quoted but not sure that it causes a problem

define('PHPMAILER_SECURE',tls);