Question: In SMS email transfer, what happens when a Mobile Originated (MO) SMS contains multiple addresses separated by commas, but the receiving gateway does not support this format?
Option 1: The receiving gateway will automatically split the message and deliver it to each address.
Option 2: The receiving gateway will accept the message but ignore the additional addresses beyond the first one.
Option 3: The receiving gateway may choose to either support the format or reject the message, with no specified error response required.
Option 4: The receiving gateway shall reject the original message and return an appropriate error in a text message.
Explanation: According to specifications for SMS email transfer, if a receiving gateway does not support multiple addresses in a single MO SMS (separated by commas), it is mandated to reject the original message. This rejection must be communicated back through an appropriate error message in text form, ensuring the sender is notified of the failure due to unsupported address formatting.