There is also discrepancies between the help file and various SK articles. The subject either has no quotes, single quote or double quotes and neither work.
Help File
internal_sendmail [-s subject] -t mailserver [-f sender_email] recipient_email [recipient_email ...]
SK25941
internal_sendmail -s "SUBJECT" -t IP_ADDRESS_of_SMTP_SERVER [-f SENDER_E-MAIL@DOMAIN] RECIPIENT1_E-MAIL@DOMAIN [RECIPIENT2_E-MAIL@DOMAIN ...]
sk56701
internal_sendmail -s '<SUBJECT>' -t <IP_ADDRESS_of_SMTP_SERVER> -f <FROM_ADDRESS> <TO_ADDRESS_1> <TO_ADDRESS_2> <TO_ADDRESS_3>