One of the most commonly searched issues on Google is how to return mail to sender. Many of our users who use webmail for their business ask why their webmail not sending emails or why they can not reply to their mail. In this article, we will show you how to return mail to sender.
Why You Are Not Able to Send or Reply Emails?
Mail servers have an SMTP authentication feature enabled in them, to validate users who try to send emails through that server. The ‘SMTP AUTH’ error usually happens when users try to send emails without properly authenticating their mail account in email clients such as Outlook or Thunderbird.
With the latest cPanel/WHM update, email accounts that were working fine till now may find their emails getting undelivered, showing this error message :
This has happened due to the latest security feature implemented in cPanel/WHM – ‘SMTP AUTH’ requires SSL by default. To combat spamming in servers and to provide secure email transmission, email clients that try to send emails without using secure transmission will be denied delivery mail return to sender.
Probably you can not fix this error by installing a plugin to your WordPress website or from your Cpanel. So WHM is the only way to fix this. Because The option that determines this is EXPERIMENTAL: Rewrite From header to match actual sender which is set to “remote” by in some case.
Why You Need WHM to Fix Return Mail to Sender?
WHM (Web Hosting Manager) is the administrative console for Cpanel based internet web hosting servers. Cpanel is the control panel for user’s for their web hosting accounts and operated on ports 2082 through 2083 generally.
WHM is the control panel for the administrator who manages the server and sets up and manages the Cpanel user accounts and logins and operates on ports 2086 and 2087 typically. Basically, Cpanel and WHM is the same software, it just refers to the user interface versus the administrator interface.
Ready? Let’s get started.
First, you need to Login your own WHM server with Username and Password. The login URL is something like https://server.yourdomain.com:2087
After you successfully logged in, WHM dashboard appears to you. Here you can find many options to configure your Server almost same as Cpanel Dashboard. Now, find Exim Configuration from all option in WHM. In Top Left corner you can see a search bar. Type Exim Configuration and click “Exim Configuration Manager” from the list.
Now, In Exim Configuration Manager Dashboard go to Basic Editor > Mail > EXPERIMENTAL: Rewrite From header to match actual sender. Here you should do the brainstorm. If you see EXPERIMENTAL: Rewrite From header to match actual sender is set to “REMOTE” change it to “disable” (default) and click save.
On the other hand if your EXPERIMENTAL: Rewrite From header to match actual sender is already set to “disabled” (default) and you’re getting the same error. Then set it to “enabled” (all) then click save. Again change it to “disabled” (default) and save it again.
Now go back to your Webmail and try to send your mail. Hopefully, you will see everything worked fine. This is the way to fix your Webmail. If you’re using Mail Client such as Mailbird, Thunderbird, Microsoft Outlook and getting same error follow the instruction above and it’ll fix in a moment. No need to change settings of your respective Mail Client settings.
What if You Don’t Have WHM Access:
So basically who runs VPS and Dedicated server for their business must have a WHM (Web Hosting Manager). And if you running shared hosting for your blog, personal website or an eCommerce store you probably do not have the access of WHM. So Contact your hosting provider regarding this issue and mention them EXPERIMENTAL: Rewrite From header to match actual sender must set as “disabled” (default).
We hope this article helped you learn how to return mail to sender. If you have any question regarding this articles please contact us anytime.