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Editorial Team
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Asked: 2026-05-12T14:06:12+00:00

We’re experiencing errors when someone tries to send an email using non-English characters (á

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We’re experiencing errors when someone tries to send an email using non-English characters (á é ñ). Is there a specific configuration that needs to be made on the SMTP server or in code?

This is the error that we’re getting:

System.FormatException: The specified string is not in the form required for an e-mail address.
  at System.Net.Mime.MailBnfHelper.ReadMailAddress(String data, Int32& offset, String& displayName)
  at System.Net.Mail.MailAddress.ParseValue(String address)
  at System.Net.Mail.MailAddress..ctor(String address, String displayName, Encoding displayNameEncoding)
  at System.Net.Mail.MailAddress..ctor(String address)
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1 Answer

  1. Editorial Team

    That looks like they’re trying to send to/from an address with non-English characters in.

    As far as I can tell, RFC 2822 only supports ASCII within email addresses.

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