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receiving error message: an error occures..(SMTP) error...The server responded: Svc not available, closing transmission channel

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I proceed to send an email and receive this error message. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: Service not available, closing transmission channel. Then I check my SENT folder, and it was sent?

I proceed to send an email and receive this error message. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: Service not available, closing transmission channel. Then I check my SENT folder, and it was sent?

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Despite the appearance of mail in the sent folder. If you receive an error message it is highly unlikely the mail was actually sent.