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Method parameters

The SendMessageNL method:

  1. Allows to send a message to the recipients listed in a CSV file
  2. Synchronously executes the following steps:

    1. Scheduling of a sending at the date and time contained in the parameters
    2. Return of a delivery ID to the caller

  3. Asynchronously executes the following steps:

    1. Creation of a group in MailUp in which to gather the recipients that have to be imported
    2. Import to MailUp of the recipients included in the file. Recipients will be imported to the list indicated by the filename (see Appendix B for details)


  • int SendMessageNL(string accessKey, string fileName, string separator, string listId, string listGuid, string messageId, string senderName, string sender, string subject, DateTime timeDateSending, intsendDelayTest)
    • accessKey: access key obtained using the Login method
    • fileName: name of the CSV files containing the recipients of the message
    • separator: separating character used in the CSV file. If null or empty, the character ';' will be used by default.
    • listId: list identifier
    • listGuid: GUID of the list in MailUp
    • messageId: ID of the message to be sent
    • senderName: name of the sender of the message. If null or empty, the system will use the default name for the list.
    • sender: indirizzo email del mittente del Messaggio. If null or empty, the system will use the default address for the list. If no default sender has been defined for the list, the sending does not start.
    • subject: subject of the message
    • timeDateSending: date and time of scheduled sending
    • sendDelayTest: desired delay for the immediate sending

Parameters listGuid listId can be used together or alternatively, passing one of them as null or empty: in the first case the list is verified using both parameters, otherwise using only the provided parameter.


SendMessageNL method

  • Requires the CSV file to be moved to MailUp servers before method is called
  • Manages import and sending for a specific list. Differently from batch FTP imports from a CSV file, this method does not allow to import contacts to different lists. All recipients must be imported in the same list
  • The file containing the recipients must be in CSV format (can also be provided in a compressed format using ZIP compression).The file and its fields must be structured following the guidelines contained in the Appendix B
  • Cannot perform a check on the possible duplication of contacts in the file, so the customer's system that creates the file has to take on this check. Method call fails when duplicated contacts are found in CSV file.

The combination of the parameters timeDateSending and sendDelayTest determines the date of the scheduled sending 

TimeDateSending parameter can assume the following values:

  • If date and time refer to the past the sending is handled as an Immediate sending. Minimum delay depends on the value provided by sendDelayTest parameter.
  • If date and time indicate a time in the future then the sending is handled as a Scheduled sending

SendDelayTest is considered only if the value provided by timeDateSending parameter indicates an Immediate sending.

This parameter can assume the following values:

  • = or < 0. In this case the delay of the immediate sending is a fixed value defined in MailUp (setup takes 20 minutes).
  • > 0. The delay of the immediate sending is the value assumed by the parameter.

How a sending is scheduled according to the parameters timeDateSending e sendDelayTest is summed up in the following table



Scheduled sending date in MailUp

value <= current date (Immediate sending)

sendDelayTest > 0

current date + sendDelayTest

value <= current date (Immediate sending)

sendDelayTest <= 0

current date + fixed value in MailUp

value > current date (Scheduled sending)

sendDelayTest > 0


value > current date (Scheduled sending)

sendDelayTest <= 0


The method returns

  • the ID of the sending
  • -1 in case the operation is not completed successfully (e.g. due to incorrect parameters or system failure).


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