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Spam comming through firewall

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Last Modified: 2012-04-20
We recently installed a new firewall. Afterwards, our smartphones were not able to send mail (but could receive). We loosened the SMTP access rules, but now we're getting spammed to death.

Currently, we allow SMTP from ANY source interface, ANY Source IP to our mail server. Before, we only allowed SMTP from our MX servers to our mail server.

Any help would be great. Thanks.
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