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The following code throws an exception of "An invalid character was found in the mail header: 'ñ'.":
string email = "ñ@c.com";
MailAddress to = new MailAddress(email);
The actual address I'm running into this is a valid address, but the MailAddress class throws an error whenever I try and use it.
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Based on the result above, the regex has validated emails with .com, . net, and . gov as valid addresses.
Invalid email addresses belong to inactive recipients who don't engage with your content. The unengaged email addresses can be invalid for a few reasons: Invalid emails can have typos or misformatting that do not lead to a legitimate inbox.
An email address also may have an associated display name for the recipient, which precedes the address specification, now surrounded by angled brackets, for example: John Smith <[email protected]>.
Yeah, interesting. According to Wikipedia: Email Address, it's strictly defined as being a subset of ASCII, so that is technically invalid.
So, it seems you just strictly can't send email to that address from .NET (using the System.Net.Mail classes, anyway).
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