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A comment on Ask HN: Gmail alternatives?. Parent comment

Re:Ask HN: Gmail alternatives? by eli on Friday February 12, 2010 @06:57PM (#1122189)
That works great until a spambot decides to start spamming <1000 common usernames>@yourdomain.com
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Re:Ask HN: Gmail alternatives? by imp on Friday February 12, 2010 @08:44PM (#1122349)
Isn't that what SPF is designed to protect? They'll never get through if you have a strict SPF record that lists AuthSMTP as the only email server for your domain.
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