On Sep 18, 2013, at 9:07 AM, NANOG <na...@abcsupply.com> wrote: > We recently purchased new IP addresses from ARIN
No, actually, you didn't. You were assigned the use of the addresses, based on need. Just as a radio station does not "purchase" spectrum. https://www.arin.net/policy/nrpm.html#four3 > Our mail server IP address is 74.112.99.25. Is it possible they are blocking > us based on old information from the previous IP address block owner? Quite likely, yes. John LeCoque's suggestions seemed quite sound: > I would say the first step is to find an immediate workaround for your end > users - maybe bring up a VM on AWS or some other cloud provider to use as > an SMTP relay while you work out the blacklist issue. If you run into > blacklist issues after that, you may want to take a very close look at your > outbound mailflow to make sure your organization isn't sending out messages > that could be categorized as spam. -Bill
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