Recoverable error.
The local host sends this message to the sender when the sender mail data set exceeds the maximum length specified by the MAXMAILBYTES option in the configuration data set.
SMTP continues.
Shorten the mail data set, or subdivide the long data set into two or more shorter data sets that are within the existing MAXMAILBYTES limitations. Increase the value for the MAXMAILBYTES option in the configuration data set, and try again.
SMTPEVNT
StoreData