What is the Default MTA in Ubuntu?

[Jeremiah Foster]

Hi there,

Is the default MTA for Ubuntu-desktop postfix? If so, it is my
understanding is that this is different from the default MTA under
debian which is exim4.

Could someone please clarify this for me or point me to a relevant URL?
Google has produced some results generally supporting my understanding
of postfix/exim in Ubuntu but I would like something a bit more
authoritative.

- Is there a rationale for using postfix and not exim?
- Is postfix going to remain the default MTA?


Thank you,

	Jeremiah