Problem

Special characters (characters with ascent) are not visible in EMail body of mails sent by Sentinel Monitoring Alert/Rules

Resolution

Special characters are UTF-8 charactes. For the email to be interpreted properly, you need to add the following property in the server.properties file:
axway.smtp.mail.encoding=UTF-8

Note:
If you are not using UTF-8, replace the value with your specific character set. If this property is not set, the email client will use its default character set, causing the characters to not be displayed correctly if there is a mismatch.