Title: Error – Could Not Authenticate Last modified: November 20, 2023 --- # Error – Could Not Authenticate * Resolved [naumanejaz](https://wordpress.org/support/users/naumanejaz/) * (@naumanejaz) * [2 years, 6 months ago](https://wordpress.org/support/topic/error-could-not-authenticate-2/) * Hey, all was working fine but now my website is unable to send mails, order confirmation mails etc. Please see the error below (Note: I changed the password of the email and changed it in the plugin as well, still the same) * Versions: WordPress: 6.4.1 WordPress MS: No PHP: 8.0.29 WP Mail SMTP: 3.10.0 Params: Mailer: smtp Constants: No ErrorInfo: SMTP Error: Could not authenticate. Host: server107.orangehost.com Port: 26 SMTPSecure: string(0) “” SMTPAutoTLS: bool(true) SMTPAuth: bool(true) Server: OpenSSL: OpenSSL 1.1.1u 30 May 2023 Apache. mod_security: No Debug: Email Source: WP Mail SMTP Mailer: Other SMTP SMTP Error: Could not authenticate. SMTP Debug: 2023-11-20 11:00:27 Connection: opening to server107.orangehost.com:26, timeout=300, options=array() 2023-11-20 11:00:27 Connection: opened 2023-11-20 11:00:27 SERVER -> CLIENT: 220-server107.orangehost. com ESMTP Exim 4.96.2 #2 Mon, 20 Nov 2023 15:00:27 +0400 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. 2023- 11-20 11:00:27 CLIENT -> SERVER: EHLO thevoltagefitness.com 2023-11-20 11:00: 27 SERVER -> CLIENT: 250-server107.orangehost.com Hello thevoltagefitness.com[ 209.172.2.70]250-SIZE 52428800250-8BITMIME250-PIPELINING250-PIPECONNECT250-AUTH PLAIN LOGIN250-STARTTLS250 HELP 2023-11-20 11:00:27 CLIENT -> SERVER: STARTTLS 2023-11-20 11:00:27 SERVER -> CLIENT: 220 TLS go ahead 2023-11-20 11:00:27 CLIENT- > SERVER: EHLO thevoltagefitness.com 2023-11-20 11:00:27 SERVER -> CLIENT: 250- server107.orangehost.com Hello thevoltagefitness.com [209.172.2.70]250-SIZE 52428800250- 8BITMIME250-PIPELINING250-PIPECONNECT250-AUTH PLAIN LOGIN250 HELP 2023-11-20 11:00:27 CLIENT -> SERVER: AUTH LOGIN 2023-11-20 11:00:27 SERVER -> CLIENT: 334 VXNlcm5hbWU6 2023-11-20 11:00:27 CLIENT -> SERVER: [credentials hidden] 2023- 11-20 11:00:27 SERVER -> CLIENT: 334 UGFzc3dvcmQ6 2023-11-20 11:00:27 CLIENT - > SERVER: [credentials hidden] 2023-11-20 11:00:29 SERVER -> CLIENT: 535 Incorrect authentication data 2023-11-20 11:00:29 SMTP ERROR: Password command failed: 535 Incorrect authentication data SMTP Error: Could not authenticate. 2023-11- 20 11:00:29 CLIENT -> SERVER: QUIT 2023-11-20 11:00:29 SERVER -> CLIENT: 221 server107.orangehost.com closing connection 2023-11-20 11:00:29 Connection: closed SMTP Error: Could not authenticate. Viewing 4 replies - 1 through 4 (of 4 total) * [Nukak Asanansi](https://wordpress.org/support/users/nasanansi/) * (@nasanansi) * [2 years, 6 months ago](https://wordpress.org/support/topic/error-could-not-authenticate-2/#post-17216700) * Hi [@naumanejaz](https://wordpress.org/support/users/naumanejaz/), * Thanks for reaching out. * Please kindly bear in mind that the error message you are getting is coming from your SMTP hosting provider. The times we have seen this error, it usually indicates that the SMTP password for your server is incorrect. And because of this, the SMTP server you’re trying to connect to is rejecting it.When you get a chance, please double-check the password you’re using with the SMTP connection to be sure it’s correct.Also please know, that the Other SMTP mailer option does not use a dedicated API, which can lead to potential errors based on your website hosting/SMTP settings.In cases where ongoing issues arise while using the Other SMTP mailer, we generally recommend switching to a transactional mailer option( it’s all mailers except the _Other SMTP_ and _Default (none)_ option).You can see the complete list of all the available mailers [here](https://wpmailsmtp.com/docs/a-complete-guide-to-wp-mail-smtp-mailers/). * I hope this helps! * Thanks 🙂 * Thread Starter [naumanejaz](https://wordpress.org/support/users/naumanejaz/) * (@naumanejaz) * [2 years, 6 months ago](https://wordpress.org/support/topic/error-could-not-authenticate-2/#post-17217242) * Hey, * As I’ve said that the password is alright, I’ve double checked. And, I don’t see how it could randomly stop working? Like, everything was working normally and then all of a sudden it stopped and gave the above error? * [Nukak Asanansi](https://wordpress.org/support/users/nasanansi/) * (@nasanansi) * [2 years, 6 months ago](https://wordpress.org/support/topic/error-could-not-authenticate-2/#post-17219527) * Hi [@naumanejaz](https://wordpress.org/support/users/naumanejaz/), * Thank you for getting back to us. * If your password is correct and you haven’t made any changes on the site recently, then it’s likely that there is something blocking the connection or authentication. * When you get some time, please check the following: 1. Contact your SMTP Host with the error and our message about it. They can look into this and perhaps advise if there is something blocking the connection from their end. 2. Ensure you are using the latest version of WP Mail SMTP (**3.10.1**). Please update the plugin if you aren’t. 3. Please check your Site Health (**Tools > Site Health**) to see if there are any other issues on the site * I hope this helps. * Thanks! - This reply was modified 2 years, 6 months ago by [Nukak Asanansi](https://wordpress.org/support/users/nasanansi/). * [C-Tomoe](https://wordpress.org/support/users/c-tomoe/) * (@c-tomoe) * [2 years, 6 months ago](https://wordpress.org/support/topic/error-could-not-authenticate-2/#post-17224869) * Hi, * I’ve got exactly the same issue. Started on November 9th. Before that, everything was OK for years. I re-entered settings and also tried with another email from a very different provider, nothing changed, still have the “Could Not Authenticate” error. WordPress and plugins are all up to date. No issue in Site Health. SMTP is set on “other SMTP”. * Best regards Viewing 4 replies - 1 through 4 (of 4 total) The topic ‘Error – Could Not Authenticate’ 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/) * 4 replies * 3 participants * Last reply from: [C-Tomoe](https://wordpress.org/support/users/c-tomoe/) * Last activity: [2 years, 6 months ago](https://wordpress.org/support/topic/error-could-not-authenticate-2/#post-17224869) * Status: resolved