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Professional

4 Core CPU
8GB DDR4 Ram
120 GB Storage
Unlimited Domains
Unlimited Accounts
Zimbra Collaboration Suit
Desktop Apps (Mac/Windows)
Solid Security
Full Root Access
SPF, DKIM, rDNS, DMARC, BIMI, etc

Corporate

6 Core CPU
12GB DDR4 Ram
240 GB Storage
Unlimited Domains
Unlimited Accounts
Zimbra Collaboration Suit
Desktop Apps (Mac/Windows)
Solid Security
Full Root Access
SPF, DKIM, rDNS, DMARC, BIMI, etc

Enterprise

8 Core CPU
16 GB DDR4 Ram
320 GB Storage
Unlimited Domains
Unlimited Accounts
Zimbra Collaboration Suit
Desktop Apps (Mac/Windows)
Solid Security
Full Root Access
SPF, DKIM, rDNS, DMARC, BIMI, etc