Capacities, Limits
Mailbox Capacity
| Mailbox Type | Capacity | Comment |
| Microsoft 365 Personal Mailbox | 50 GB | Users with A3 and A5 Plans have twice the capacity |
| Personal mailbox in InSIS | 50 MB | i.e. 1000 times smaller than Microsoft 365 |
| Shared mailboxes in Microsoft 365 | 50 GB |
Sending emails from the mailbox is blocked when approaching the limit; incoming emails are rejected when exceeded.
Size of Emails
| Message Type | Size | Comment |
| An incoming email to school mail | 15 MB | Including the total size of all attachments |
| Emails between Office 365 | 35 MB | It is better to upload the file on OneDrive and send only a link to the file |
| An outgoing email from Office 365 to the outside internet mail | 18 MB | It is better to upload the file on OneDrive and send only a link to the file |
| An outgoing email from InSIS | 15 MB | Such a large email will usually not be sent because the capacity of the mailbox is exceeded |
| Size of the message sent via smtp.vse.cz | 15 MB | Applies to users with IMAP access to their mailbox |
Office 365 – when sent using the Outlook desktop client, the maximum message size increases to 84 MB.
Number of Messages and Recipients in Message
| Limit type | Count | Comment |
| Office 365 – max recipients per day | 10,000 | For all sent messages from one mailbox |
| Office 365 – maximum of recipients in one message | 500 | Email addresses in To, Cc and Bcc are counted |
| smtp.vse.cz – maximum of recipients per day | 2,000 | For all messages sent in 24 hours |
| smtp.vse.cz – maximum of emails per day | 500 | In 24 hours |
More Information
Other limits of Microsoft 365 (A1/A3 limits apply to VŠE).
InSIS Detailed Information
Since the days when Office 365 was not used, some user groups in InSIS have a higher mailbox capacity – system integrators, managers, teachers, doctoral students. When the last role is completed, everyone’s mailbox capacity is reduced to 48 MB.
When the mailbox in InSIS is full, the emails are rejected and the set mail forwarding does not work. The so-called system messages sent from InSIS are delivered even when the mailbox is full.