IMGate/postfix will deliver to MX's that has "numeric" RDATA fields, as will most dedicated MTA's, including sendmail.I'm an ISP as many of you are, what do you tell a customer when you're not able to deliver it's mail to a domain that has an IP in it's MX record?
and postfix is usually pretty RFC/restrictive.
If Imail won't, it is in a fairly tiny minority, afaics.
Len
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