Integra is a large network provider telecom that has acquired a number of different, smaller companies over the years. They do handle mail for some of these companies, but not for others. Our previous network provider was bought by Integra around 2006 or 2007 but we always handled our own mail.
They do not publish much information about sending mail to Integra managed email.
There are no published limits for connection. Integra limits sending to 100 emails per address .
Integra does not offer a postmaster site.
Integra does not offer a FBL.
Integra does not offer a whitelist.
Integra is using Cisco Ironport mail appliance as their incoming mail system.