Title: Errors after installing and activating the plugin Last modified: November 28, 2023 --- # Errors after installing and activating the plugin * Resolved [shey18](https://wordpress.org/support/users/shey18/) * (@shey18) * [2 years, 6 months ago](https://wordpress.org/support/topic/errors-after-installing-and-activating-the-plugin/) * Hello, * I get “Illegal String Offset” and “Cannot Modify Header Information” errors after installing the plugin. * Here is a screenshot: [https://ibb.co/qDD8tG7](https://ibb.co/qDD8tG7) * I’m on WP version 6.4.1 and using the latest version of the Divi theme. * Please help. * Thank you. Viewing 5 replies - 1 through 5 (of 5 total) * [furqanfazal](https://wordpress.org/support/users/furqanfazal/) * (@furqanfazal) * [2 years, 6 months ago](https://wordpress.org/support/topic/errors-after-installing-and-activating-the-plugin/#post-17234598) * Hi [@shey18](https://wordpress.org/support/users/shey18/), * I hope this message finds you well. * Thank you for contacting us regarding the issue you are facing. To assist you more effectively, could you please provide us with the diagnostic test report? You can access the diagnostic test report from [here](https://postmansmtp.com/documentation/others/how-to-get-diagnostic-test-report/). * This information will help us to resolve the issue faster. * Thanks and Regards, Support Team-WP Experts * Thread Starter [shey18](https://wordpress.org/support/users/shey18/) * (@shey18) * [2 years, 6 months ago](https://wordpress.org/support/topic/errors-after-installing-and-activating-the-plugin/#post-17237285) * Thank you for the response! Here’s the Diagnostic Test Report: * ```wp-block-code Mailer: postsmtpHostName: [removing this for security reasons]cURL Version: 7.85.0OpenSSL Version: OpenSSL/3.0.9OS: Linux c108297.sgvps.net 5.15.126-MCIclouder399 #399 SMP PREEMPT Wed Aug 16 16:53:17 EEST 2023 x86_64PHP: Linux 7.4.33 CPHP Dependencies: iconv=Yes, spl_autoload=Yes, openssl=Yes, sockets=Yes, allow_url_fopen=Yes, mcrypt=No, zlib_encode=YesWordPress: 6.4.1 en_US UTF-8WordPress Theme: Divi ChildWordPress Plugins: ManageWP - Worker, Post SMTP, Gravity Forms, Conditional Menus, Divi Overlays, Duplicate Page, Yoast Duplicate Post, Gravity Divi - Gravity Forms Styler for Divi, Gravity Forms Help Scout Add-On, WP Armour - Honeypot Anti Spam, Image Intense, Redirection, Search Engine Visibility, Speed Optimizer, Security Optimizer, Wordfence Security, Yoast SEO, WP101 Video Tutorial PluginWordPress wp_mail Owner: /home/customer/www/[domain]/public_html/wp-content/plugins/post-smtp/Postman/PostmanWpMailBinder.phpWordPress wp_mail Filter(s): PostsmtpMailer->get_mail_argsWordPress wp_mail_from Filter(s): wordfence::fixWPMailFromAddressPostman: 2.8.5Postman Sender Domain (Envelope|Message): gmail.com | gmail.comPostman Prevent Message Sender Override (Email|Name): No | NoPostman Active Transport: Default (smtp:none:none://localhost:25)Postman Active Transport Status (Ready|Connected): No | YesPostman Selected Transport: Gmail API (https:login://www.googleapis.com:443)Postman Selected Transport Status (Ready|Connected): No | YesPostman Deliveries (Success|Fail): 0 | 0Postman File Locking (Enabled|Temp Dir): No | /tmp ``` * [furqanfazal](https://wordpress.org/support/users/furqanfazal/) * (@furqanfazal) * [2 years, 6 months ago](https://wordpress.org/support/topic/errors-after-installing-and-activating-the-plugin/#post-17238776) * Hi [@shey18](https://wordpress.org/support/users/shey18/), * Thank you for sharing the information. We tried to replicate your case on our end but no issue was found. Could you please let us know if you recently downloaded a new Post SMTP plugin, or did you update an existing one? If it’s an update, can you tell us the version you’ve upgraded from? * Thanks and Regards, Support Team-WP Experts * Thread Starter [shey18](https://wordpress.org/support/users/shey18/) * (@shey18) * [2 years, 6 months ago](https://wordpress.org/support/topic/errors-after-installing-and-activating-the-plugin/#post-17240487) * Hello, * We were previously using WP Mail SMTP by WPForms, then deactivated and uninstalled it. And then I installed Post SMTP. Upon activation, I saw the errors. I initially ignored them but when I proceeded with using the setup wizard, I wasn’t able to save my changes because it would redirect me to a page containing nothing but the errors. * [furqanfazal](https://wordpress.org/support/users/furqanfazal/) * (@furqanfazal) * [2 years, 6 months ago](https://wordpress.org/support/topic/errors-after-installing-and-activating-the-plugin/#post-17242001) * Hi [@shey18](https://wordpress.org/support/users/shey18/), * We tried multiple scenarios to replicate your case on our end but unfortunately, no issue was found. Please create a ticket on our [technical support channel](https://objectsws.atlassian.net/servicedesk/customer/portal/16) so our technical team can directly connect with you. * Your cooperation is greatly appreciated, and we look forward to assisting you further. * Thanks and Regards, Support Team-WP Experts. Viewing 5 replies - 1 through 5 (of 5 total) The topic ‘Errors after installing and activating the plugin’ is closed to new replies. * ![](https://ps.w.org/post-smtp/assets/icon-128x128.gif?rev=3209655) * [Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App](https://wordpress.org/plugins/post-smtp/) * [Frequently Asked Questions](https://wordpress.org/plugins/post-smtp/#faq) * [Support Threads](https://wordpress.org/support/plugin/post-smtp/) * [Active Topics](https://wordpress.org/support/plugin/post-smtp/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/post-smtp/unresolved/) * [Reviews](https://wordpress.org/support/plugin/post-smtp/reviews/) * 5 replies * 2 participants * Last reply from: [furqanfazal](https://wordpress.org/support/users/furqanfazal/) * Last activity: [2 years, 6 months ago](https://wordpress.org/support/topic/errors-after-installing-and-activating-the-plugin/#post-17242001) * Status: resolved