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When sending emails an alert message pops up "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.

Can you help me with this please

When sending emails an alert message pops up "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. Can you help me with this please

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got a phone connected to mail? try turning it off

however in the past that error usually means the provider has disabled your ability to send mail (one connection is one to many as the account is disabled) This is usually the result of sending more mail than their terms of use allow.