Hello Everyone!
Requirement:
If you want to increase the size of the outgoing emails from SAP or if they are stuck in the queue with a red status and error saying :
Cannot process message; maximum size exceeded
This clearly indicates that email and the attachment in it is too big to get it sent over
Solution:
We can try compressing the email or changing the size of attachment .
Parameters related to the size of email and its attachment are customizable.
The customizing table is called SXPARAMS - SAPconnect: Parameter Table.
Its maintenance is available t-code SOST -> Utilities -> General Parameters or via SM30 -> SXPARAMS.

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Few parameters related to size of email and its components:
Parameter Parameter value
MAXLEN_BODYPART_SMTP 0 ... 999999999999 size for a document
MAXLEN_BODYPART_ALI_SMTP 0 ... 999999999999 lists of the type ALI
MAXLEN_BODYPART_OTF_SMTP 0 ... 999999999999 SAPscript documents
MAXLEN_MIME_MESSAGE_SMTP 0 ... 999999999999 MIME MIME attachments
Again we need to maintain one more parameter of SCOT. It is related to size of email.
MAXLEN_BODYPART_EXT_SMTP size for an attachment, default value: 10485760

Apart from that we can also restrict the attachment size by handling in the code.
So as soon as we click on attachment button of the email in the attachment event(EH_ONATTACH_BTN) of GS_CM component
Sample Code:
DATA: lr_upload TYPE REF TO cl_thtmlb_fileupload.
IF htmlb_event->server_event EQ 'attach'.
* check if uploadfile is filled
lr_upload = get_upload( ).
IF lr_upload->file_content IS NOT INITIAL.
* check attachment size
IF lr_upload->file_length > 9000000.
"size of the attachment as per the requirement
lv_msgsrv = cl_bsp_wd_message_service=>get_instance( ).
lv_msgsrv->add_message( iv_msg_type = ‘E’
iv_msg_id = 'XXXXX'
iv_msg_number = '000' ).
rv_error = 'X'.
RETURN.
ENDIF.
ENDIF.
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