By default, each mailbox has 300MB of storage space for emails.
Please note: A mail server is not a file server. Binary data is one third larger when saved as an email attachment.
To prevent spam, accounts have a maximum number of emails that can be sent within a certain time.
Current information about the quota of your account can be found in the Mailconf interface (see below).
In the so-called Mailconf interface (www4.inf.h-brs.de/mailconf) you will find current details about your e-mail account: