Title: Error when updating Plugin
Last modified: August 9, 2022

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# Error when updating Plugin

 *  Resolved [belenberrueta](https://wordpress.org/support/users/belenberrueta/)
 * (@belenberrueta)
 * [3 years, 10 months ago](https://wordpress.org/support/topic/error-when-updating-plugin-4/)
 * Hi,
 * I updated the plugin to the latest version (3.5.1) and then when testing my Contact
   Form (Contact Form 7) I found that when clicking in “Send message” an error message
   would appear and the message would not be send.
 * In the plugin when testing the email this error appears:
    Attention! The last
   email your site tried to send was not sent successfully. Mailer: Otro SMTP SMTP
   Error: Could not authenticate.
 * I have the same plugin in several sites, but this error appears only in the two
   sites I updated the plugin.
 * I already tried installing a previous version, but nothing changes.
 * What would you think the problem would be?
 * Thanks in advance.
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ferror-when-updating-plugin-4%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 1 replies (of 1 total)

 *  Plugin Support [Darshana](https://wordpress.org/support/users/darshanaw/)
 * (@darshanaw)
 * [3 years, 10 months ago](https://wordpress.org/support/topic/error-when-updating-plugin-4/#post-15909886)
 * Hi [@belenberrueta](https://wordpress.org/support/users/belenberrueta/),
 * Thanks for reaching out! This issue is not related to the WP Mail SMTP update
   and that is the reason you’re getting the same error on the previous versions
   as well.
 * The SMTP error generally indicates that your web server isn’t able to connect
   to the SMTP server. There could be a firewall between your web server and the
   SMTP server or something similar.
 * When you send a test email from **WP Mail SMTP > Tools** area, you should be 
   able to see the full error. Here’s [a screenshot](https://a.supportally.com/3Hc3lq)
   of the option to get a full error log. This will provide you with an idea of 
   what might be going on.
 * Also, you can check **WP Mail SMTP -> Tools -> Debug Events** section to see 
   if there are any errors.
 * Then, get in touch with your hosting/email support with the full error log, and
   they should be able to assist you further.
 * I hope this helps. Thanks!

Viewing 1 replies (of 1 total)

The topic ‘Error when updating Plugin’ 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/)

 * 1 reply
 * 2 participants
 * Last reply from: [Darshana](https://wordpress.org/support/users/darshanaw/)
 * Last activity: [3 years, 10 months ago](https://wordpress.org/support/topic/error-when-updating-plugin-4/#post-15909886)
 * Status: resolved