Using the Email Client Library

An introduction to the Email Client library with an example project.


The Email Client library provides you with an API to create and send emails from within your AIMMS project. The library does not require any external programs to be installed and can be used from both AIMMS Developer and AIMMS PRO. It is also available on AIMMS Cloud.

You can use this feature, for example, to send emails containing the results of your optimization model to other users in your organization.

Supported features:

  • template files with related attachments (such as images)
  • placeholders in templates (to be replaced by data specified in AIMMS identifiers)
  • downloadable file attachments

Adding the library

Add EmailClient to your project from the library repository using the Library Manager. For more details, see AIMMS Knowledge: Using AIMMS Libraries.



Installing the Email Client library caches it on your local machine and adds a reference to it in your AIMMS application. The library source itself is not added to your model. When you start the app, AIMMS checks whether the library is cached on your computer, and downloads it from the AIMMS Library Repository if needed.

Creating and sending the email

You will need to declare string parameters for the library to store the message ID and any error messages.

StringParameter messageID;
StringParameter ErrorMessage;

In a procedure, use the statements below to connect to an SMTP server, create a new email and set the sender and recipient information.

!Set the SMTP server
email::SetServer("", 25);

!Create new email with the specified subject, sender's name and email.
email::NewMail("Test mail", "Test Sender", "", messageID);

!Add recipient information
email::AddRecipientTo(messageID, "Test Recipient", "");

!Insert statements to create body of the email, discussed in next sections

!Send the email via the specified SMTP server
email::SendMail(messageID, ErrorMessage);

!Close the email message

Specify an SMTP server which you are allowed to access (i.e., your corporate mail server, or an SMTP server associated with an email account you hold). The email::SetServer function has additional arguments to let you provide authentication information if required by the SMTP server.

You can add multiple recipients to the same email by repeating the email::AddRecipientTo statement, or use email::AddRecipientCC or email::AddRecipientBCC to CC or BCC additional recipients.

See details in AIMMS Documentation: Email Client API.

Using Placeholders in an Email Message Template

You can replace predefined strings in your template with data from AIMMS identifiers. These replaceable strings are called Placeholders. You need to declare a set whose elements are the placeholders that you want to replace and declare a parameter indexed over this set. The values from this indexed parameter will replace the placeholder strings in the email body.

Set Placeholders {
    Index: i;
    Definition: data { CustomerName, CustomerNumber };

StringParameter PlaceholderValues {
    IndexDomain: i;

The function email::SetMessageFromFile creates the body of the email from the templates you specify and replaces the placeholders with the values specified in PlaceholderValues:

! Create the body of the email message from text and HTML templates and placeholder values
email::SetMessageFromFile(messageId, "EmailTemplate.txt", "EmailTemplate.html", PlaceholderValues);


Replacements are done one-by-one, in order. Avoid using a placeholder value that contains the entire name of another value. For example, using the placeholders CUSTOMER, CUSTOMERNAME would result in the replacement (e.g.) 123, 123NAME and no replacements would occur for CUSTOMERNAME.

Adding images and attachments

Add any images contained in the HTML body as related attachments:

! Add images contained in HTML body as related attachments
email::AddRelatedAttachment(messageID, "EmailTemplate_files/image001.jpg", "image001.jpg");
email::AddRelatedAttachment(messageID, "EmailTemplate_files/image002.png", "image002.png");

To specify any other file attachments:

! Add a file attachment to the email message

Read more about creating templates for your message in AIMMS Knowledge: Creating Email Templates.

For a full list of functions available, read AIMMS Documentation: Email Client API.


Download an example AIMMS project containing an email procedure: