Comments on: How to Install Postfix with Roundcube Webmail on Ubuntu and Debian

By: wiseguy

wiseguy — Sun, 31 May 2026 08:38:49 +0000

You generally don't set the FQDN directly with hostnamectl, such as:

hostnamectl set-hostname mail.tecmint.com

On Linux, the hostname is typically the short hostname, for example:

hostnamectl set-hostname mail

The Fully Qualified Domain Name (FQDN) is usually defined through DNS records or the /etc/hosts file, for example:

127.0.1.1 mail.tecmint.com mail

The system's resolver then uses this information to determine and return the FQDN when requested.

By: Ravi Saive

Ravi Saive — Wed, 27 Nov 2024 04:30:45 +0000

In reply to Nadun Perera.

@Nadun,

It seems like the issue is with Roundcube’s SMTP configuration.

Make sure that the SMTP hostname, port, and encryption (SSL/TLS) settings in Roundcube are correct.

By: Nadun Perera

Nadun Perera — Tue, 26 Nov 2024 13:31:07 +0000

Everything works fine, except when sending emails roundcube gives an error and does not send emails. It can receive emails.

   
Error message :  SMTP Error (): Connection to server failed

Outlook works fine)

Please advise

By: Ravi Saive

Ravi Saive — Thu, 30 Nov 2023 04:07:16 +0000

In reply to mario.

@Mario,

Make sure to verify the file and directory permissions, ensuring that the web server has the necessary access to the files. Incorrect permissions could result in a 404 error.

Also, check your configuration settings to ensure they are correctly set up like database connections, and any other relevant configuration details.

By: mario

mario — Wed, 29 Nov 2023 17:42:38 +0000

I followed every step I downloaded everything but the webmail said error 404.