why i am unable to send email get error message
an error occurred while sending mail. the mail server sent an incorrect greeting smtp04.mailcore.me: too many concurrent smtp connections. please try again later
an error occurred while sending mail. the mail server sent an incorrect greeting smtp04.mailcore.me: too many concurrent smtp connections. please try again later
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That sounds like you mail provider has suspended or cancelled your account.
I suggest you contact them to ensure your account is active.