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Editorial Team
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Editorial Team
Asked: May 16, 20262026-05-16T08:04:55+00:00 2026-05-16T08:04:55+00:00

We have a exchangeserver configured to send the attachment of a email as fax

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We have a exchangeserver configured to send the attachment of a email as fax if the the “to-address-field” is in the format [fax:user/company@faxnumber] (used internally). It works when I send manually from Outlook. But how can send an email with to-address as above using Smtpclient?

Is it possible to suppress the emailaddress validation? at the moment i get this error:
“System.FormatException : The specified string is not in the form required for an e-mail address.”

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  1. Editorial Team
    Editorial Team
    2026-05-16T08:04:55+00:00Added an answer on May 16, 2026 at 8:04 am

    It is not possible through the SmtpClient. If fax=asdfasdf is wanted then going through interop.outlook.dll is needed.

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