Hybrid Exchange - Firewall Rules SMTP

[S Aziz]

Hello,

We have Exchange 2010 that we are going to "Hybridize" for migration to O365.  We currently have 4 Hub Transport Servers that sit behind KEMP load balancers.

Can anyone outline the firewall rules needed to facilitate mail flow in this scenario?  For example:

SMTP Inbound: O365-->VIP or individual IP's?

SMTP Outbound: VIP or individual IP's-->External?

Thanks.

[#2 · Accepted solution]

Hi @S Aziz,

If you have already the rules in Kemp you do not need more rules, just use the mailflow rules that you are using.

If you can give more details we here can help.