Postfix and Sendmail - newbie question

Hello, I've just installed Postfix in my box...

And I try to start it, it report OK, but it didn't start at all...

Then I notice in the description of Postfix and Sendmail, they are both MTA... So I think that maybe there's only one MTA can be run at a time... I shutdown Sendmail and start Postfix, everything gone well...

I do some search and saw that Postfix is better than Sendmail, so I want to use Postfix Postfix and Sendmail - newbie question

But I don't know if I stop using Sendmail, switch to Postfix, is there any problem?

For example, PHP's mail() function use sendmail to send mail (or course)... is there any relation between /usr/sbin/sendmail and Sendmail?

And the last, can I run them simulately?

 

 

 

 

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