Does anyone know if setting up SPF for a primary domain would affect virtual domains that shares it's IP in Imail? Will the virtual domains start to fail SPF tests because the IP that they are bound to in DNS lists only the primary domain's name in the SPF record. Will I be forced to setup SPF for all my client's virtual domains as well? I'm hoping to move into SPF gradually, not in one big shot.
SPF doesn't know or care about virtual domains.
SPF works by having a TXT record for a domain (such as example.com) that says what IPs are allowed to send E-mail from that domain. SPF doesn't know that it is a virtual domain, so it is fine to have multiple domains allowing mail to be sent from the same IP.
-Scott
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