Currently, Emmesmail places a 500 character limit on an addressbook entry. This places a limit on the number of recipients a given email may be mailed to using an addressbook entry.

A mailinglist may be used to send copies of an email to a virtually unlimited number of recipients. The format of a mailinglist is one email address per line, with no limit on the number of lines.

Whenever an email message is slated to be delivered to more that three recipients, there is a choice as to the format of the "To:" line in the email header. The three possibilities for the format of the "To:" line in the email is determined by the to_info parameter, which is given in the msm.ini file. If to_info is 0, the "To:" line will say "To: Undisclosed recipients". If to_info is 2, each email will have all the recipients listed on the "To:" line. If to_info is 1, each email that is sent out has a "To:" line that lists just that email's recipient. With to_info = 1, it is possible to send what appear to be individualized emails to large numbers of people on a mailinglist.

Another parameter, again defined in msm.ini, which affects the format of the "To:" field is to_ask. If to_ask is 0, every time an email is sent to more than three recipients, the "To:" line is formated according to the to_info value. If to_ask is 1, the user is asked each time whether he or she wishes to change the to_info value, either just for the email being processed, or for all future emails.

Any of the parameters in the msm.ini file may be changed from the Configure Action Console by clicking on the "Send" button.