end of message (EoM)
End of Message (EoM) is a control sequence of a data block with which the end of the message is marked.
In ATM, the EoM signal is used to mark a service data unit( SDU) in a protocol data unit( PDU). If the segment type identification field of the Segmentation and Reassembly Sublayer( SAR-PDU) is occupied in the ATM adaptation layer ofAAL-3/4, then the end of the SAR SDU is in the corresponding SAR PDU.
For e-mails, some communication partners write a short message in the subject field to shorten the transmission time and end this message with an EOM hint.