If the email addresses are from the same ISP, then there shouldn't be a problem. If they're from different providers, then changing the SMTP server to the same as your main account usually allows you to do that.
My Reccomendation,Is Incredimail,All the rest are so boring.But if I had to pick another,I would probably go with Thunderbird.Never tried it ,Never will. But so many folk Reccomend it.It looks like the obvious choice.
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