[BlueOnyx:26344] 5210R sendmail to postfix switch questions

[oldcabin webmaster]

 5210R

I am pondering switching from sendmail to postfix.

Anything that I should be aware of with regard to what is going to change
regarding my client's email client setups?

Is there anything that they will have to change in their settings?

Can I switch back if I suddenly run into issues (my clients)

Thanks

--Tim
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