For outbound connections, you can use policy-based routing as the previous poster suggested. If ISP B provides SMTP gateway services/relay, you can simply point your internal SMTP server to route all outbound mail traffic to ISP B's SMTP gateway (no need for policy-based routing for this)
For inbound, it's another matter. If you got allocated different blocks of IP addresses from both ISPs, it's simply: simply register your MX record using an IP address from ISP B's block of addresses.
Oh, by the way, BGP with your ISPs is a given, I reckon. Static routing will be too hard to maintain, can lead to sub-optimal routing at best and routing loops at worst. :-)
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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