ACS commons sends mail to multiple recipients separately causing duplicate emails

To ensure the email is sent only once to all recipients (including CC and BCC), you can consolidate the recipients into a single email send operation rather than looping through each toEmail individually. Try this 

Map<String, String> emailParams = new HashMap<>();
emailParams.put("subject", subject);
emailParams.put("body", bodyText.toString());

// Instead of adding ccEmail and bccEmail here, we will pass them directly to the email service call
Map<String, DataSource> attachments = new HashMap<>();
if (!(fileName.isEmpty() || excelString.isBlank())) {
try {
attachments.put(fileName, new ByteArrayDataSource(excelString, "text/plain"));
} catch (IOException e) {
log.info("Exception {} creating attachment", e);
}
}

// Convert comma-separated emails into a List<String> for recipients, cc, and bcc.
String[] toEmails = toEmail.split(",");
String[] ccEmails = ccEmail.isEmpty() ? new String[0] : ccEmail.split(",");
String[] bccEmails = bccEmail.isEmpty() ? new String[0] : bccEmail.split(",");

// Sending the email with EmailService to multiple recipients, cc, and bcc in a single call.
List<String> failureList = emailService.sendEmail(
"/etc/notification/email/email-template.txt",
emailParams,
attachments,
toEmails,
ccEmails,
bccEmails
);

Hi @jaisr1 

I'm not sure if this issue is specific to your email client or if it applies to others as well.

In AEM, you can control where each recipient is placed (in CC or BCC), but ideally, the email provider should be able to detect duplicate recipients and ensure that only one email is sent to each.

@jaisr1 Did you find the suggestions helpful? Please let us know if you require more information. Otherwise, please mark the answer as correct for posterity. If you've discovered a solution yourself, we would appreciate it if you could share it with the community. Thank you!