Why does cron use MTA to send emails, while we use MUA to send emails?

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I have looked at the definitions of MTA, MUA, MDA, for example, https://ccm.net/contents/116-how-email-works-mta-mda-mua and https://en.wikipedia.org/wiki/Email_agent_(infrastructure)



  • In Lubuntu, the default email client is Sylpheed, and many also use Thunderbird. If I am correct, both Sylpheed and Thunderbird are MUA.


  • In https://unix.stackexchange.com/a/479613/674, Stephen mentioned that cron uses MTA (such as postfix or sendmail) to send the outputs of its jobs as emails.


My questions are:



  • why does cron use MTA instead of MUA to send emails, while we use MUA (Sylpheed or Thunderbird) instead of MTA to send emails?


  • When we install MUA (Sylpheed or Thunderbird) , does Sylpheed or Thunderbird need a MTA installed on the same machine to send emails?


Thanks.






cron email thunderbird mail-transport-agent






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    up vote
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    I have looked at the definitions of MTA, MUA, MDA, for example, https://ccm.net/contents/116-how-email-works-mta-mda-mua and https://en.wikipedia.org/wiki/Email_agent_(infrastructure)



    • In Lubuntu, the default email client is Sylpheed, and many also use Thunderbird. If I am correct, both Sylpheed and Thunderbird are MUA.


    • In https://unix.stackexchange.com/a/479613/674, Stephen mentioned that cron uses MTA (such as postfix or sendmail) to send the outputs of its jobs as emails.


    My questions are:



    • why does cron use MTA instead of MUA to send emails, while we use MUA (Sylpheed or Thunderbird) instead of MTA to send emails?


    • When we install MUA (Sylpheed or Thunderbird) , does Sylpheed or Thunderbird need a MTA installed on the same machine to send emails?


    Thanks.






    cron email thunderbird mail-transport-agent






    share























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I have looked at the definitions of MTA, MUA, MDA, for example, https://ccm.net/contents/116-how-email-works-mta-mda-mua and https://en.wikipedia.org/wiki/Email_agent_(infrastructure)



      • In Lubuntu, the default email client is Sylpheed, and many also use Thunderbird. If I am correct, both Sylpheed and Thunderbird are MUA.


      • In https://unix.stackexchange.com/a/479613/674, Stephen mentioned that cron uses MTA (such as postfix or sendmail) to send the outputs of its jobs as emails.


      My questions are:



      • why does cron use MTA instead of MUA to send emails, while we use MUA (Sylpheed or Thunderbird) instead of MTA to send emails?


      • When we install MUA (Sylpheed or Thunderbird) , does Sylpheed or Thunderbird need a MTA installed on the same machine to send emails?


      Thanks.






      cron email thunderbird mail-transport-agent






      share













      I have looked at the definitions of MTA, MUA, MDA, for example, https://ccm.net/contents/116-how-email-works-mta-mda-mua and https://en.wikipedia.org/wiki/Email_agent_(infrastructure)



      • In Lubuntu, the default email client is Sylpheed, and many also use Thunderbird. If I am correct, both Sylpheed and Thunderbird are MUA.


      • In https://unix.stackexchange.com/a/479613/674, Stephen mentioned that cron uses MTA (such as postfix or sendmail) to send the outputs of its jobs as emails.


      My questions are:



      • why does cron use MTA instead of MUA to send emails, while we use MUA (Sylpheed or Thunderbird) instead of MTA to send emails?


      • When we install MUA (Sylpheed or Thunderbird) , does Sylpheed or Thunderbird need a MTA installed on the same machine to send emails?


      Thanks.






      cron email thunderbird mail-transport-agent




      cron email thunderbird mail-transport-agent





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      Tim

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