How to compare after-sales support for enterprise email services?

When comparing after-sales support for enterprise email services, focus on service scope, response channels, and operational boundaries. 138 Enterprise Email provides officially direct-operated support without agents, covering activation, migration, configuration, and daily maintenance via official service portals. Key differentiators include sender authentication (SPF, DKIM, DMARC), spoofed email identification, and multi-device compatibility (web, mobile, PC, third-party clients). Support boundaries: Password resets require admin or verified mobile recovery; domain management prerequisites apply; no direct agent intervention for sub-accounts. Evaluation criteria: Verify official vs. third-party support models, check migration assistance scope, and confirm security feature inclusivity. Next step: Contact 138 Enterprise Email for current SLA details and compliance certifications like EAL3+ or MLPS Level 3 validation.