I spotted new issue today that if a user is sending a document file which has extension .DOC and more then 15 characters file name, email is not reaching to other domains. But when the same file is zipped with same name (more then 15 characters) it is reaching to other domains.
When same file is saved in other extension e.g. .DOCX email is reaching to other domains. I am still confused why this type of behavior is happening from iRedMail server after running over a year.
Can anyone guide further as it is now becoming critical for business?