Title: Incorrect authentication Last modified: March 9, 2021 --- # Incorrect authentication * [Andi Riza](https://wordpress.org/support/users/andimicro/) * (@andimicro) * [5 years, 2 months ago](https://wordpress.org/support/topic/incorrect-authentication/) * I use smtp.yandex.com port 587. * I use SPF like this -> v=spf1 ip4:103.153.3.19 include:spf.yandex.net ~all I’ve used the right username and password, I tried logging in on Yandex and was able to log in. So username and password are not a problem. * The result: — 220-idn12.dewabiz.com ESMTP Exim 4.93 # 2 Tue, 09 Mar 2021 21: 20:35 +0700 220-We do not authorize the use of this system to transport unsolicited, 220 and / or bulk e-mail. EHLO kalselventura.co.id 250-idn12.dewabiz.com Hello kalselventura.co.id [103.153.3.19] 250-SIZE 52428800 250-8BITMIME 250-PIPELINING 250-AUTH PLAIN LOGIN 250-STARTTLS 250 HELP STARTTLS 220 TLS go ahead EHLO kalselventura. co.id 250-idn12.dewabiz.com Hello kalselventura.co.id [103.153.3.19] 250-SIZE 52428800 250-8BITMIME 250-PIPELINING 250-AUTH PLAIN LOGIN 250 HELP AUTH PLAIN 334 AGZvcm1Aa2Fsc2VsdmVudHVyYS5jby5pZABCYW51YV8xNzgx 535 Incorrect authentication data * I am confused where it went wrong? The topic ‘Incorrect authentication’ is closed to new replies. * ![](https://s.w.org/plugins/geopattern-icon/postman-smtp_7c7b78.svg) * [Postman SMTP Mailer/Email Log](https://wordpress.org/plugins/postman-smtp/) * [Frequently Asked Questions](https://wordpress.org/plugins/postman-smtp/#faq) * [Support Threads](https://wordpress.org/support/plugin/postman-smtp/) * [Active Topics](https://wordpress.org/support/plugin/postman-smtp/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/postman-smtp/unresolved/) * [Reviews](https://wordpress.org/support/plugin/postman-smtp/reviews/) * 0 replies * 1 participant * Last reply from: [Andi Riza](https://wordpress.org/support/users/andimicro/) * Last activity: [5 years, 2 months ago](https://wordpress.org/support/topic/incorrect-authentication/) * Status: not resolved