Authentication error

Resolved

(@usestrict)

Hi,

I’m trying to set up WP Mail SMTP with a new SMTP server and keep getting authentication failure. I contacted the sysadmin and he said the following:

It is trying to use CRAM authentication, which won’t work. You need to use either PLAIN or LOGIN.

Is there a way to set the type of authentication? Here is the full error log:

Versions:
WordPress: 5.8.1
WordPress MS: No
PHP: 7.4.23
WP Mail SMTP: 3.0.3

Params:
Mailer: smtp
Constants: No
ErrorInfo: SMTP Error: Could not authenticate.
Host: ***ipp.com
Port: 587
SMTPSecure: tls
SMTPAutoTLS: bool(true)
SMTPAuth: bool(true)

Server:
OpenSSL: OpenSSL 1.1.0l  10 Sep 2019

Debug:
Email Source: WP Mail SMTP
Mailer: Other SMTP
SMTP Error: Could not authenticate.

SMTP Debug:

2021-09-21 15:45:45 Connection: opening to ***ipp.com:587, timeout=300, options=array()

2021-09-21 15:45:46 Connection: opened

2021-09-21 15:45:46 SERVER -> CLIENT: 220 allegro.isipp.com ESMTP Sendmail 8.15.2/8.15.2/Debian-8+deb9u1; Tue, 21 Sep 2021 15:45:46 GMT; (No UCE/UBE) logging access from: [x.x.x.x](FORGED)-x.x.x.x.vultr.com [x.x.x.x.x] (may be forged)

2021-09-21 15:45:46 CLIENT -> SERVER: EHLO ***.com

2021-09-21 15:45:46 SERVER -> CLIENT: 250-***ipp.com Hello 216.128.149.225.vultr.com [216.128.149.225] (may be forged), pleased to meet you250-ENHANCEDSTATUSCODES250-PIPELINING250-EXPN250-VERB250-8BITMIME250-SIZE250-DSN250-AUTH DIGEST-MD5 CRAM-MD5250-STARTTLS250-DELIVERBY250 HELP

2021-09-21 15:45:46 CLIENT -> SERVER: STARTTLS

2021-09-21 15:45:46 SERVER -> CLIENT: 220 2.0.0 Ready to start TLS

2021-09-21 15:45:46 CLIENT -> SERVER: EHLO ***.com

2021-09-21 15:45:46 SERVER -> CLIENT: 250-***ipp.com Hello x.x.x.x.vultr.com [216.128.149.225] (may be forged), pleased to meet you250-ENHANCEDSTATUSCODES250-PIPELINING250-EXPN250-VERB250-8BITMIME250-SIZE250-DSN250-AUTH DIGEST-MD5 CRAM-MD5 LOGIN PLAIN250-DELIVERBY250 HELP

2021-09-21 15:45:46 CLIENT -> SERVER: AUTH CRAM-MD5

2021-09-21 15:45:46 SERVER -> CLIENT: 334 PDE1NTg5NDg4NDcuNDg0OTI5MUBhbGxlZ3JvLmlzaXBwLmNvbT4=

2021-09-21 15:45:46 CLIENT -> SERVER: [credentials hidden]

2021-09-21 15:45:46 SERVER -> CLIENT: 535 5.7.0 authentication failed

2021-09-21 15:45:46 SMTP ERROR: Username command failed: 535 5.7.0 authentication failed

SMTP Error: Could not authenticate.

2021-09-21 15:45:46 CLIENT -> SERVER: QUIT

2021-09-21 15:45:46 SERVER -> CLIENT: 221 2.0.0 ***ipp.com closing connection

2021-09-21 15:45:46 Connection: closed

SMTP Error: Could not authenticate.

Cheers,
Vinny

Viewing 4 replies - 1 through 4 (of 4 total)

Thread Starter useStrict
(@usestrict)

4 years, 8 months ago
I found a solution:
```
add_filter( 'wp_mail_smtp_custom_options', function( $phpmailer ) {
    $phpmailer->AuthType = 'LOGIN';

    return $phpmailer;
} );
```
It’d be nice if there were a simpler way to test that, or if the plugin could cycle through the options when something fails.
tico87
(@tico87)

4 years, 8 months ago
```
I found a solution:

add_filter( 'wp_mail_smtp_custom_options', function( $phpmailer ) {
    $phpmailer->AuthType = 'LOGIN';

    return $phpmailer;
} );
```
Where to put this line?
- This reply was modified 4 years, 8 months ago by tico87.
tico87
(@tico87)

4 years, 8 months ago

@usestrict
Where to put this line?

Sanjeev Aryal
(@sanzeeb3)

4 years, 8 months ago

Hi @tico87,

You can check out the documentation on ways to add custom code snippets in your site.

However, it is probably not the same error you’re getting. If that does not fix the issue, please create a new support post with the SMTP error.

@usestrict – WordPress (PHPMailer) uses these auth types in order:

CRAM-MD5, LOGIN, PLAIN, XOAUTH2

But if the receiving SMTP server is not configured correctly, it will fail at the first one.

I hope this clarifies!

Viewing 4 replies - 1 through 4 (of 4 total)

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