Quartz 4

Recent Notes

Postfix

2 min read

For more details, check Mail Server - Gemini.pdf

Config

/etc/postfix/main.cf → main config

  • Normally, inet_interfaces=localhost so users on same device can mail each other with:
mail -s "Mail Subject" atakan@nexonet.space

[yazinin kendisi]
CTRL^D

/var/log/maillog → mail log

Myhostname

Used for specifying the hostname of the mail server mail.example.com

mydomain

Mail domain example.com

myorigin

All mail sent from this mail server will look as though it came from this option $mydomain

mydestination

Basically whitelist of possible receivers.

  • It has $myhostname, which allows users on the same system to mail each other
  • You can add external IP ranges to allow emailing external clients.
  • You can add $mydomain to allow any device with your domain to mail each other.

relayhost

Use that server as a relayhost, a proxy for mail forwarding

mynetwork

Only accept emails from this specified network

inet_interfaces

Which interfaces are allowed (??) Can be all

inet_protocols

Which protocols to work with

To show queue: postqueue -p mailq viewqueue

postfix q → flush the queue and deliver all emails

Mailx

The mailx program (also called s-nail, BSD mail, or Heirloom mailx) is a command-line email client used to:

  • Compose and send emails from the terminal
  • Read local mail from /var/mail/username
  • Send mail using SMTP, often via sendmail or postfix in the background

🧩 What it is not:

  • It’s not a mail server.
  • It doesn’t receive mail on its own — that’s Postfix’s job.

🧪 Common use:

echo "Hello" | mail -s "Test Subject" someone@example.com

This sends a basic email using the system’s MTA (Postfix).

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