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As per this thread - same issue
I have integrated the same implementation as yours.
I am also facing the same issue.
Whenever I used to call "mail.addPart("ext.gt.test.MyResources", labels.getString("Message"), null, "text/html");" this function, I am not able to recieve any email.
But without mail.addPart function call, I am able to receive email.
Could you send the format of the Resource Bundle file that you had registered and the location of that file?
Or do you find any other way to add content to the mail?