SMTPSendFailedException 501 Invalid MAIL FROM address provided

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SMTPSendFailedException 501 Invalid MAIL FROM address provided

Hi All,
In SMPT host i'm using Host address name instead off IP address.
Getting below error: 501 Invalid MAIL FROM address provided.
Thanks
kumar.talend
 
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Re: SMTPSendFailedException 501 Invalid MAIL FROM address provided

what is your "mail from" address?  Is it of the form somebody@somewhere?