Roundcube Webmail Not Sending Emails

Roundcube is an open-source, web-based IMAP email application that allows you to access your email accounts from any device. Still, some issues have been dealt with while sending email messages. If Roundcube Webmail Not Sending Emails, then continue reading this page to know how to fix it.

Roundcube Webmail Not Sending Emails

Simple solution

Before performing the advanced methods, make sure that the computer or device on which you’re using the Roundmail webmail is connected to an active Internet connection. Similarly, make sure that your ISP (Internet Service Provider) is not blocking port 25.

Advanced solution

  • Step : 1 Access the Roundcube webmail using the server hostname or IP address.
  • Step : 2 Check if the webmail’s server host is set to localhost. If not, set it as localhost and then try to send an email message.
  • Step : 3 Look for the PHP errors in the apache error.log, and if you find any, resolve them.
  • Step : 4 Try to reinstall the Roundcube webmail and try to send an email message.
  • Step : 5 If a pop-up dialog box titled An error occurred! with the message “SMTP error (-1): Connection to server failed.” is displayed on the screen, check whether you have installed CSF/LFD. (Note: CSF/LFD is used to block the SMTP connection on Roundcube.)
  • Step : 6 If you have installed it, then the SMTP_BLOCK feature is enabled on Roundcube. To check whether SMTP_BLOCK is enabled, run the following command:
  • Step : 7 grep ^SMTP_BLOCK /etc/csf/csf.conf
  • Step : 8 Now, the status of SMTP_BLOCK will be displayed on the screen. If you find its value to be 1, then the following SMTP connection 465, 587, or 25 is blocked on Roundcube.
  • Step : 9 To fix this issue, disable the SMTP_BLOCK option by following the below instructions.
  • Step : 10 Run the following commands:
  • Step : 11 SMTP_ALLOWLOCAL = "0"
  • Step : 12 SMTP_REDIRECT = "0"
  • Step : 13 SMTP_PORTS = "25,465,587"
  • Step : 14 SMTP_ALLOWUSER = "webapps"
  • Step : 15 SMTP_ALLOWGROUP = "mail,mailman"
  • Step : 16 After running the above commands, restart the csf/lfd.
  • Step : 17 Now, try to send the email message from Roundcube.

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