The only solution for this is to ask your provider to open a certain port that will allows to connect on SMTP server for you to send and receive emails directly on newsletters.. By default, this should be opened at port 25 and 587, if this is controlled and block then it is your provider limits this features. In my case however I am using third party direct mail service instead and none of this technical issues that gives me a problem.
Regards,
Aries
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