Title: SMTP ERROR: Password command failed Last modified: February 6, 2018 --- # SMTP ERROR: Password command failed * [Nobella67](https://wordpress.org/support/users/nobella67/) * (@nobella67) * [8 years, 4 months ago](https://wordpress.org/support/topic/smtp-error-password-command-failed/) * I’m using WP Mail SMTP and have the following error when trying to send a test mail to my Office 365 mailbox: * Versions: WordPress: 4.9.3 WordPress MS: No PHP: 5.6.23 WP Mail SMTP: 1.2.5 * Params: Mailer: smtp Constants: Yes ErrorInfo: SMTP connect() failed. [https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting](https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting) Host: smtp.office365.com Port: 587 SMTPSecure: tls SMTPAutoTLS: bool(true) SMTPAuth: bool(true) * Server: OpenSSL: Yes SMTP Debug: 2018-02-06 13:48:44 Connection: opening to smtp.office365.com:587, timeout=300, options=array ( ) 2018-02-06 13:48:45 Connection: opened 2018-02-06 13:48:45 SERVER -> CLIENT: 220 CWLP265CA0028.outlook.office365. com Microsoft ESMTP MAIL Service ready at Tue, 6 Feb 2018 13:48:44 +0000 2018- 02-06 13:48:45 CLIENT -> SERVER: EHLO [http://www.adminwiz.co.za](http://www.adminwiz.co.za) 2018-02-06 13:48:45 SERVER -> CLIENT: 250-CWLP265CA0028.outlook.office365.com Hello [41.76.215.246] 250-SIZE 157286400 250-PIPELINING 250-DSN 250-ENHANCEDSTATUSCODES 250-STARTTLS 250-8BITMIME 250-BINARYMIME 250-CHUNKING 250 SMTPUTF8 2018-02-06 13:48:45 CLIENT -> SERVER: STARTTLS 2018-02-06 13:48:46 SERVER -> CLIENT: 220 2.0.0 SMTP server ready 2018-02-06 13:48:46 CLIENT -> SERVER: EHLO [http://www.adminwiz.co.za](http://www.adminwiz.co.za) 2018-02-06 13:48:46 SERVER -> CLIENT: 250-CWLP265CA0028.outlook.office365.com Hello [41.76.215.246] 250-SIZE 157286400 250-PIPELINING 250-DSN 250-ENHANCEDSTATUSCODES 250-AUTH LOGIN XOAUTH2 250-8BITMIME 250-BINARYMIME 250-CHUNKING 250 SMTPUTF8 2018-02-06 13:48:46 CLIENT -> SERVER: AUTH LOGIN 2018-02-06 13:48:46 SERVER - > CLIENT: 334 VXNlcm5hbWU6 2018-02-06 13:48:46 CLIENT -> SERVER: aW5mb0BhZG1pbndpei5jby56YQ == 2018-02-06 13:48:46 SERVER -> CLIENT: 334 UGFzc3dvcmQ6 2018-02-06 13:48:46 CLIENT -> SERVER: UDQkJHcwcmQ= 2018-02-06 13:48:53 SERVER -> CLIENT: 535 5.7.3 Authentication unsuccessful [CWLP265CA0028.GBRP265.PROD.OUTLOOK.COM] 2018-02- 06 13:48:53 SMTP ERROR: Password command failed: 535 5.7.3 Authentication unsuccessful[ CWLP265CA0028.GBRP265.PROD.OUTLOOK.COM] 2018-02-06 13:48:53 SMTP Error: Could not authenticate. 2018-02-06 13:48:53 CLIENT -> SERVER: QUIT 2018-02-06 13:48: 53 SERVER -> CLIENT: 221 2.0.0 Service closing transmission channel 2018-02-06 13:48:53 Connection: closed 2018-02-06 13:48:53 SMTP connect() failed. * What I’ve checked and done: 1. Made sure that the ISP has opened the correct port for Office 365 2. Made sure that outbound email on the ISP’s side is enabled 3. Checked that the username and password is correct in the settings by logging into Office 365 with the same credentials (it works) 4. Made sure that email routing on the server is set to Remote Mail Exhange 5. Updated the WP Mail SMTP plugin to the latest version 6. Uninstalled and reinstalled the plugin, but the results are the same 7. Used another Office 365 account, but still the results are the same 8. Changed the port to 25 instead of 587, but still the results are the same * I’m out of ideas, I’ve followed all suggestions that I came across and still nothing. My ISP has now suggested that I start digging around in Office 365, what to look for I’m not sure, and check my credentials, which I’ve checked and it works when logging in through microsoftonline.com. * Please any suggestions would be greatly appreciated! * Thanks in advance. * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fsmtp-error-password-command-failed%2F%3Foutput_format%3Dmd&locale=en_US) to see the link]_ Viewing 2 replies - 1 through 2 (of 2 total) * Plugin Author [Slava Abakumov](https://wordpress.org/support/users/slaffik/) * (@slaffik) * [8 years, 4 months ago](https://wordpress.org/support/topic/smtp-error-password-command-failed/#post-9947043) * The error is saying password, but you’ve checked that. So now, you would need to check office365.com settings regarding external access to inbox. Is it allowed? * Check this link [https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_dep365/smtpoffice365com-relay-535-573-authentication/9de8d176-1c07-4e66-b14f-148d3bd51bbf?auth=1](https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_dep365/smtpoffice365com-relay-535-573-authentication/9de8d176-1c07-4e66-b14f-148d3bd51bbf?auth=1) * Also, make sure that for the username, Office365 requires the username in your SMTP configuration to be your full email address, which includes the domain. * Thread Starter [Nobella67](https://wordpress.org/support/users/nobella67/) * (@nobella67) * [8 years, 4 months ago](https://wordpress.org/support/topic/smtp-error-password-command-failed/#post-9947837) * Thanks Slava, I’m busy checking Office 365 settings and will get back to you if I find the issue or if I need some more advice. Viewing 2 replies - 1 through 2 (of 2 total) The topic ‘SMTP ERROR: Password command failed’ 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 * [smtp error](https://wordpress.org/support/topic-tag/smtp-error/) * 2 replies * 2 participants * Last reply from: [Nobella67](https://wordpress.org/support/users/nobella67/) * Last activity: [8 years, 4 months ago](https://wordpress.org/support/topic/smtp-error-password-command-failed/#post-9947837) * Status: not resolved