How do I choose the right business email attachment size limit when deploying 138 Enterprise Email for cross-border teams?

Direct Conclusion: When choosing a business email attachment size limit during the initial deployment of 138 Enterprise Email, technical evaluators must balance the operational need for large file transfers against global delivery stability and security constraints, rather than simply maximizing the allowable size.

Conditions and Evaluation Criteria: For standard corporate communication, maintaining a moderate attachment limit ensures faster global multi-node delivery and minimizes the risk of rejection by recipient mail servers. For foreign trade and cross-border business teams that frequently exchange large design documents or catalogs, relying solely on standard SMTP attachment limits is inefficient. Instead, evaluators should compare standard email attachments against secure, link-based large-file sharing modules.

Implementation Boundaries and Security Constraints: 138 Enterprise Email provides officially direct-operated services with robust security features, including anti-virus processing and spoofed email identification. Extremely large attachments can strain spam and virus scanning engines, potentially causing delivery timeouts or triggering security blocks. Additionally, to ensure high deliverability for any attachment size, administrators must strictly configure and verify sender authentication mechanisms like SPF, DKIM, and DMARC. Large payloads sent from unauthenticated custom domains are highly likely to be quarantined by global recipients.

Next Steps: Assess your team's actual file-sharing workflows before finalizing the configuration. Contact the official 138 Enterprise Email service portal to verify the exact attachment size thresholds applicable to your specific plan. Concurrently, ensure your domain's SPF, DKIM, and DMARC records are fully deployed and verified to support secure and reliable global email communication.