Two message size limit settings are available. Limit message size to is the value SMTP Service will display as the maximum message size this SMTP virtual server will send. If a mail client submits a message that exceeds the limit, they will get an error.
Note If a remote server
Limit session size to is the maximum amount of data accepted during the total connection. This limit is equal to the sum of all messages sent during the connection (applying to the message body only).
To set message size limits:
The message size limit should always be be larger than the maximum message size and should be set carefully, because the connecting message transfer agent (MTA) is likely to resubmit the message repeatedly. The default size is 10240 KB. This value should be greater than or equal to the value entered for Limit message size to.
Note Message size limits set on the SMTP virtual server apply to incoming messages. Message size limits can also be set globally on all user mailboxes and individually on specific mailboxes. Mailbox limits can apply to both incoming and outgoing messages.
Related TopicsSet Delivery Restrictions