Webmail SMTP Error 250

How To Fix Webmail SMTP Error 250?

Roundcube webmail is one of the popular free email service providers. An Webmail SMTP error 250 on your Roudcube webmail client indicates an authentication failure. It usually happens when you try to send or receive emails from your Webmail account. In general, the SMTP authentication allows only trusted users to send data through the SMTP server. Most web hosts use SMTP AUTH on their servers to prevent it from being used as open relays and spam.

Troubleshooting Steps

  • Step 1: To identify the cause of the error, enable SMTP debugging in the Roundcube configuration file.
  • Step 2: To do so, enter the following commands.
  • Step 3: $config['debug_level'] = 1;
  • Step 4: $config['smtp_debug'] = true;
  • Step 5: Next, check for the incorrect authentication settings in the SMTP server.
  • Step 6: You might also get the SMTP error 250 when there is an incorrect SMTP authentication setting.
  • Step 7: Some Roundcube webmail users configure the complex authentication methods such as CRAM MD5 in the Postfix mail server.
  • Step 8: The authentication option looks like ‘smtpd_sasl_security_options = noanonymous, noplaintext’ in the Postfix configuration file. But most of the time, Roundcube does not support this authentication.
  • Step 9: To fix this Webmail SMTP error 250, enter the following authentication option in the Postfix servers.
  • Step 10: smtpd_sasl_security_options = noanonymous
  • Step 11: Next, enable the SMTP service on the port 587 for all the IPs by selecting Tools & Settings followed by Mail Server Settings in the Roundcube webmail.
  • Step 12: Make sure that you have disabled the following parameters in the Postfix configuration file.
  • Step 13: smtpd_tls_exclude_ciphers
  • Step 14: smtpd_sasl_security_options
  • Step 15: smtpd_tls_auth_only
  • Step 16: tls_ssl_options
  • Step 17: Another cause for the SMTP error 250 is the certificate mismatch issue.
  • Step 18: It occurs when the users on the cPanel sever set up the Roundcube webmail to use TLS for outgoing emails.
  • Step 19: It is configured as the following.
  • Step 20: $config['smtp_server'] = 'tls://localhost;
  • Step 21: To fix this problem, enter the following command in the Roundcube configuration file.
  • Step 22: $config['smtp_server'] = 'tls://serverhostname.com';
  • Step 23: If you are facing configuration issues on Roundcube webmail, enter the following commands in the configuration file.
  • Step 24: $config['default_host'] = 'tls://server.hostname.com';
  • Step 25: $config['smtp_port'] = 587;
  • Step 26: $config['smtp_auth_type'] = 'LOGIN';
  • Step 27: If the problem persists, set the following commands to tweak the Roundcube configuration file.
  • Step 28: $config['smtp_user'] = ' ';
  • Step 29: $config['smtp_pass'] = ' ';

If you still have difficulties in fixing the Roundcube Webmail SMTP error 250 , contact our technical support team for remote assistance.

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