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ISMail EP is secured against attack, eavesdropping, unauthorized use, and abuse by multiple systems and configuration settings, including:
Account Quotas: account quotas may be set to limit user account message storage space on the server. Quotas can be set for the entire server, for one or more domains, and/or for individual user accounts.
Anti-Virus Filters: each message processed by ISMail EP is scanned by a command-line Anti-Virus filter. The anti-virus filter finds and removes mail-borne viruses. It also prevents users from inadvertently sending messages infected with viruses to others, thus reducing the general spread of mail-borne viruses throughout the internet.
Disk Overflow Checks: ISMail EP makes periodic checks of the disk free space on the server, and will automatically stop receiving messages if the disk becomes low on free storage.
DOS (Denial-of-Service) Defenses: ISMail EP is protected against DOS attacks by limiting the number of simultaneous connections from any IP address and also by limiting the total number of simultaneous connections from all sources.
Message Size Limits: the maximum message size is limited to 50MB by default. The maximum message size is configurable in ISMail EP.
Relay Protection: ISMail EP does not operate as an 'open relay'. All message senders must be authenticated with to send mail. This prevents ISMail from being hijacked and used to send unauthorized messages.
SMTP Authentication: ISMail EP supports several methods of SMTP Authentication; this is currently the most secure way to protect the server against unauthorized use.
SSL/TLS Encryption: ISMail EP supports up to 256-bit encryption of messages as protection against eavesdropping.