generated: '2026-07-21'
method: searched
source: https://www.zimbra.com/product/zimbra-documentation/
standards:
- id: soap
  conforms: true
  evidence: Primary programmatic interface is a SOAP API documented at files.zimbra.com/docs/soap_api/
- id: graphql
  conforms: true
  evidence: First-party @zimbra/api-client exposes a GraphQL layer over the SOAP API
- id: imap
  conforms: true
  evidence: Zimbra mail servers expose IMAP4 access for mail clients
- id: pop3
  conforms: true
  evidence: Zimbra mail servers expose POP3 access
- id: smtp
  conforms: true
  evidence: Zimbra uses Postfix MTA and speaks SMTP for mail transport
- id: caldav
  conforms: true
  evidence: Calendar access via CalDAV is documented and supported
- id: carddav
  conforms: true
  evidence: Contact access via CardDAV is documented and supported
- id: activesync
  conforms: true
  evidence: Exchange ActiveSync (mobile sync) is supported for iOS/Android devices
- id: rest-openapi
  conforms: false
  evidence: No public OpenAPI/REST contract; the programmatic surface is SOAP + GraphQL
- id: rfc9457-problem-details
  conforms: false
  evidence: Errors are returned as SOAP Faults, not application/problem+json