I am looking at the logs of the "Top 10 Clients" and the 3 of first 4 are pool....verizon.net and mobile....mycingular.net and bda....blackberry.com. Is this something to be concerned about or do the mobile devices check in so often with the mail server to cause this?
And if it is a concern what is the best way to determine if these are malicious connections? Thank you.
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