Qmail qualfon

A blast from the past!

qmail is a popular open-source mail transfer agent (MTA) that was widely used in the late 1990s and early 2000s. It was designed to be a secure, reliable, and efficient alternative to other popular MTAs like Sendmail.

qualfon is not a standard qmail command, but I'm guessing you might be referring to qualify, which is a qmail feature that allows you to specify a domain name to use when sending mail.

Here's a brief overview of qualify:

qualify is a qmail feature that allows you to specify a domain name to use when sending mail. This can be useful when you want to send mail from a specific domain, but the sender's email address doesn't include the domain.

For example, if you have a qmail server configured to send mail from the domain example.com, but you want to send mail from the email address [email protected], you can use the qualify feature to specify the example.com domain.

To use qualify, you need to add the following line to your qmail configuration file (qmail.cf or qmail-smtpd.cf):

qualify = example.com

This will tell qmail to use the example.com domain when sending mail from the email address [email protected].

Keep in mind that qualify is an old feature, and it's not widely used today. Modern MTAs like Postfix, Exim, and OpenSMTPD have more advanced features for handling domain names and email addresses.