Title: YANDEX – Error: authentication failed:Invalid format
Last modified: December 15, 2017

---

# YANDEX – Error: authentication failed:Invalid format

 *  Resolved [alone69li](https://wordpress.org/support/users/alone69li/)
 * (@alone69li)
 * [8 years, 5 months ago](https://wordpress.org/support/topic/yandex-error-authentication-failedinvalid-format/)
 * Hey friends!
 * I have error. When I inserted this code:
 * define( ‘WPMS_ON’, true );
    define( ‘WPMS_SMTP_PASS’, ‘888888’ );
 * Text error: Error: authentication failed:Invalid format

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Author [Slava Abakumov](https://wordpress.org/support/users/slaffik/)
 * (@slaffik)
 * [8 years, 5 months ago](https://wordpress.org/support/topic/yandex-error-authentication-failedinvalid-format/#post-9785810)
 * Hi there,
 * Sorry for the trouble!
    There is an issue with using constants, which will be
   fixed in the upcoming release (soon). Meanwhile, you will need to use the ordinary
   settings. After the next plugin update – you can switch back to constants.
 *  Thread Starter [alone69li](https://wordpress.org/support/users/alone69li/)
 * (@alone69li)
 * [8 years, 5 months ago](https://wordpress.org/support/topic/yandex-error-authentication-failedinvalid-format/#post-9785837)
 * Ok. Thank you so much

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘YANDEX – Error: authentication failed:Invalid format’ is closed to new
replies.

 * ![](https://ps.w.org/wp-mail-smtp/assets/icon-256x256.png?rev=1755440)
 * [WP Mail SMTP by WPForms - The Most Popular SMTP and Email Log Plugin](https://wordpress.org/plugins/wp-mail-smtp/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/wp-mail-smtp/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/wp-mail-smtp/)
 * [Active Topics](https://wordpress.org/support/plugin/wp-mail-smtp/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/wp-mail-smtp/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/wp-mail-smtp/reviews/)

## Tags

 * [yandex](https://wordpress.org/support/topic-tag/yandex/)

 * 2 replies
 * 2 participants
 * Last reply from: [alone69li](https://wordpress.org/support/users/alone69li/)
 * Last activity: [8 years, 5 months ago](https://wordpress.org/support/topic/yandex-error-authentication-failedinvalid-format/#post-9785837)
 * Status: resolved