3.1.1
Please read the instructions carefully before updating
After the device is upgraded, it will automatically restart.
Please disable "Mail Server Management> Service Management> Push Mail Function" before upgrading.
Please disable [System Management> Uninterruptible Power System] before upgrading.
In order to reduce the impact of users after upgrading to high security, this upgrade will first force the [Mail Server Management> Service Management> Encryption Security of Receiving Service] to be adjusted to low security.
If you need to enable high security, please go to "Mail Server Management> Service Management" after the upgrade.
In order to improve the efficiency of database query, this upgrade has expanded data tables, and the time required for the upgrade will vary depending on the amount of data.
Therefore, please confirm the estimated time for the upgrade before upgrading to evaluate the downtime required.

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Security enhancements for management, WebMail, [Mail Gateway> Personalization Rules] and system services SMTP(s), POP3(s), IMAP(s), personal cloud, Push Mail.
SMTP service adds support for SMTPUTF8 and fixes TLS/SSL encryption issues.
[Encryption Security of Mail Service-High Security] Note If you use port 25 or 587 to send mail, you need to establish a STARTTLS connection before it supports account password authentication AUTH and only supports higher encryption modes TLSv1.2 ~ 1.3.
[Receiving Service Encryption Security-High Security] Note If you use port 110 or 143 for receiving mail, you need to establish a STARTTLS connection before it supports account password authentication AUTH and only supports higher encryption mode TLSv1.2.
[Webmail> Write a letter] Add attachments can be dragged and uploaded. IE only supports Edge.
[Webmail> Personal Settings] Added an abnormal login notification switch.
[Webmail> Personal Settings] Added mail browsing mode function.
[Webmail> Personal Settings] Added the function of automatically adding event invitations to the private calendar.
[Webmail> Personal Settings] Add When writing a letter, whether to open a blind copy by default.