Title: Error and cannot fix it Last modified: December 18, 2025 --- # Error and cannot fix it * Resolved [anandiprema2](https://wordpress.org/support/users/anandiprema2/) * (@anandiprema2) * [5 months, 3 weeks ago](https://wordpress.org/support/topic/error-and-cannot-fix-it/) * I have this error message: **Heads up!** The last email your site attempted to send was unsuccessful. * > Email Source: Kadence Blocks – Gutenberg Blocks for Page Builder Features Mailer: > Other SMTP SMTP Error: Could not connect to SMTP host. Failed to connect to > server SMTP server error: Failed to connect to server SMTP code: 110 Additional > SMTP info: Connection timed out * For more details please try running an Email Test or reading the latest [error event](https://happydrawingtime.com/wp-admin/admin.php?page=wp-mail-smtp-tools&tab=debug-events). But if I try to change “Other SMTP” – I cannot do it. It is all in “grey” or it show up a symbol 🚫​. I changed hoster to hostinger and mails to Zoho. Appreciate help. Many thanks, Viewing 7 replies - 1 through 7 (of 7 total) * Plugin Support [Patrick](https://wordpress.org/support/users/paddyam/) * (@paddyam) * [5 months, 3 weeks ago](https://wordpress.org/support/topic/error-and-cannot-fix-it/#post-18762396) * Hi [@anandiprema2](https://wordpress.org/support/users/anandiprema2/), * Thanks for sharing the details. The error you’re seeing typically means the site cannot reach the mail server. Since you’ve switched hosting to Hostinger and mail to Zoho, this points to a connection issue with the Zoho SMTP service. * To fix this, please try out the following troubleshooting steps: - **Verify credentials:** Double‑check the SMTP host, port, username, and password being used for Zoho. If you prefer, you can use tools like [dnschecker.org/smtp-test-tool.php](https://dnschecker.org/smtp-test-tool.php) to confirm whether your server can reach Zoho’s SMTP. - **Run an Email Test:** If the credentials are correct, from your WordPress dashboard, go to **WP Mail SMTP » Tools **and send out a test email. If this fails, it confirms the server cannot reach Zoho’s SMTP, which usually indicates a hosting/network restriction rather than a WordPress misconfiguration. * **Greyed‑out fields** * Since you mentioned the fields are greyed out, this suggests the SMTP credentials are being defined via constants in your `wp-config.php` file. In that case, they cannot be edited directly in the plugin settings. You’ll need to update or remove those constants in the configuration file to regain control. Here’s a guide on how that works: [WP Mail SMTP constants setup](https://wpmailsmtp.com/docs/how-to-secure-smtp-settings-by-using-constants/#add-constants). * I hope this helps point you in the right direction. * Thread Starter [anandiprema2](https://wordpress.org/support/users/anandiprema2/) * (@anandiprema2) * [5 months, 3 weeks ago](https://wordpress.org/support/topic/error-and-cannot-fix-it/#post-18763673) * Many thanks, I will try it. * Thread Starter [anandiprema2](https://wordpress.org/support/users/anandiprema2/) * (@anandiprema2) * [5 months, 2 weeks ago](https://wordpress.org/support/topic/error-and-cannot-fix-it/#post-18765861) * So complicated!! * Plugin Support [Patrick](https://wordpress.org/support/users/paddyam/) * (@paddyam) * [5 months, 2 weeks ago](https://wordpress.org/support/topic/error-and-cannot-fix-it/#post-18766020) * Hi [@anandiprema2](https://wordpress.org/support/users/anandiprema2/), * I’m sorry to hear that and just to confirm, the greyed‑out fields just mean your SMTP settings are locked in `wp-config.php`. Once those lines are updated or removed, you’ll regain control. If editing the file feels overwhelming, I’d recommend looping in the host team for assistance with the adjustment. * For a simpler path, consider switching to one of the supported Transactional Mailers here: [WP Mail SMTP Mailers Guide](https://wpmailsmtp.com/docs/a-complete-guide-to-wp-mail-smtp-mailers/). These handle the connection for you and avoid the manual setup. * I hope this helps. * Thread Starter [anandiprema2](https://wordpress.org/support/users/anandiprema2/) * (@anandiprema2) * [5 months, 2 weeks ago](https://wordpress.org/support/topic/error-and-cannot-fix-it/#post-18766282) * **Many thanks! In the meantime, this is what I did:** * I deactivated and deleted the plugin, then removed all lines starting with ** WPMS** from the `wp-config.php` file. This may have been a bit radical, but I don’t have enough technical knowledge to troubleshoot it properly. After that, I installed the plugin again and the fields are no longer greyed out. * However, I can’t find clear instructions on how to connect it with **Zoho.eu** when using only the free account. On YouTube, I only find setup guides from Zoho that apply to their paid plans. Please could you help me? * Plugin Support [Patrick](https://wordpress.org/support/users/paddyam/) * (@paddyam) * [5 months, 2 weeks ago](https://wordpress.org/support/topic/error-and-cannot-fix-it/#post-18766873) * Hi [@anandiprema2](https://wordpress.org/support/users/anandiprema2/), * Thanks for the update on your progress. With the fields enabled, you should now be able to apply your changes and set up the mailer configuration with the correct values. * However, while I cannot confirm the specific credentials for your account, I recommend checking the SMTP credentials directly from the [Zoho Guides](https://www.zoho.com/mail/help/zoho-smtp.html#alink5). As shared, you can use tools like [dnschecker.org/smtp-test-tool.php](https://dnschecker.org/smtp-test-tool.php) to verify the credentials before setting them up within the WP Mail SMTP settings section. * Hope this helps. * Plugin Support [Patrick](https://wordpress.org/support/users/paddyam/) * (@paddyam) * [5 months, 2 weeks ago](https://wordpress.org/support/topic/error-and-cannot-fix-it/#post-18768058) * Hi [@anandiprema2](https://wordpress.org/support/users/anandiprema2/) * We haven’t heard from you in a while, so I’m going to go ahead and close out this thread for now. If you’re still having trouble, feel free to respond here at your convenience and we’ll be happy to help. * Have a great day! - This reply was modified 5 months, 2 weeks ago by [Patrick](https://wordpress.org/support/users/paddyam/). 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