Eu fiz uma pergunta para instalar o sagemath no ubuntu aqui . Mas após a instalação completa, diz:
Package configuration
Postfix Configuration │
│ Please select the mail server configuration type that best meets your
│ needs.
│
│ No configuration:
│ Should be chosen to leave the current configuration unchanged.
│ Internet site:
│ Mail is sent and received directly using SMTP.
│ Internet with smarthost:
│ Mail is received directly using SMTP or by running a utility such
│ as fetchmail. Outgoing mail is sent using a smarthost.
│ Satellite system:
│ All mail is sent to another machine, called a 'smarthost', for
│ delivery.
│ Local only:
No configuration:
│ Should be chosen to leave the current configuration unchanged.
│ Internet site:
│ Mail is sent and received directly using SMTP.
│ Internet with smarthost:
│ Mail is received directly using SMTP or by running a utility such
│ as fetchmail. Outgoing mail is sent using a smarthost.
│ Satellite system:
│ All mail is sent to another machine, called a 'smarthost', for
│ delivery.
│ Local only:
│ The only delivered mail is the mail for local users. There is no
│ network.
│
│ <Ok>
Eu não sei o que é isso? Como posso me livrar disso?