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What ports do you need open on firewall for email only on exchange?

We have an exchange server behind a firewall. I just want to be able to send and receive email. I am wondering what ports I need to open up for this functionality. I am assuming DNS port needs to be open in order to get DNS resolution? What about SMTP, POP, etc.
1 Solution
The following ports should be open:

DNS: 53
SMTP: 25
POP3: 110
IMAP4: 143
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