3085702 - Dump STRING_SIZE_TOO_LARGE occurred for email sending background job

The following short dump can be found:

Category                          ABAP programming error
Runtime Errors                STRING_SIZE_TOO_LARGE
ABAP Program                SAPLSSFC
Application Component   BC-SEC-SSF

Error Analysis:
A string with a length xxxxxxxxxx (bytes) was about to be created.
However, this length exceeds the maximum size possible for a string of xxxxxxxxxx.

Information on where terminated
The termination occurred in ABAP program "SAPLSSFC", in "SSFC_BASE64_ENCORE".
The main program was "RSCONN01".

• SAP Netweaver
• Release independent 

STRING_SIZE_TOO_LARGE, SAPLSSFC, RSCONN01, background job, SMTP, mail size, mpi/total_size_MB , KBA , BC-SRV-COM , Communication Services: Mail, Fax, SMS, Telephony , BC-SEC-SSF , Secure Store and Forward , Problem