We provide the end users with the step by step details to configure their email clients, which prevents email delivery failures with the error“454 4.7.1 Relay access denied”. The settings for SMTP authentication, SMTP server and security varies in each mail client. Some of the commonly used email clients areOutlook Express, Microsoft Outlook, Thunderbird and so on. In cases where we notice that the issue is not a server wide one, but specific to the user account, it is obvious that the error has happened due to incorrect email client settings of that user. How to fix “454 4.7.1 Relay access denied”inThunderbird, Outlook Express and Microsoft Outlook Once the configuration of Roundcube or Squirrelmail or other webmail clients are properly done, users can send emails without any errors. SMTP port for incoming and outgoing mails.TLS/SSL settings for secure email delivery.SMTP authentication settings for users.The parameterswe configure for smooth SMTP functioning are: We’ve seen that webhosts who havenot configured it correctly, have users facing error 454 while sending mails.Īt Bobcares, our Web Support Specialists have expertise configuring 3rd party software such as Roundcube and Squirrelmail for our customers who are web hosts. In Squirrelmail, the configuration file is ‘config.php’ and is configured using thePerl script‘’. If the settings provided in this section go wrong during the setup, it will give 454 error. Roundcube has a configuration file ‘’, which is used for the SMTP configuration settings. How to fix “454 4.7.1 Relay access denied” in Roundcube and Squirrelmail If any configuration mistake happens in the installation process of 3rd party softwaresuch as Roundcube and Squirrelmail, no user from the server would be able to send mails using these webmail clients. While Outlook and Thunderbird are user specific email clients and have to be configured by individual users, webmail such as Squirrelmail and Roundcube are installed and configured server wide. Checking the mail logs, bounce message and confirming with other email clients help to pinpoint if the issue is with the mail client or server settings. So the first thing we do when users report 454 error is to check and confirm why the error happened in that server. Incorrect settings in the email client can cause mail delivery to fail, when the mail account tried to send a mail to an external domain from a Postfix server, without proper authentication. Unless specifically excluded from authenticating to SMTP mail server by adding the IPs to the trusted network, Postfix does not allow anyone to relay through the mail server. How to fix “454 4.7.1” in mail clients –Outlook, Squirrelmail, Thunderbird and Roundcube
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