Failed to parse Authentication Results where smtp.mailfrom contains an "="

[The-Nutty]

Describe the bug
AuthenticationResults.Parse Throws an error when the smtp.mailfrom address contains an "="

Platform (please complete the following information):

• OS: Windows
• .NET Framework: Net core 3.1
• MimeKit Version: 2.9.1

To Reproduce
Run the follwing code var ar = AuthenticationResults.Parse(Encoding.ASCII.GetBytes(@"i=1; relay.mailrelay.com; dkim=pass header.d=domaina.com header.s=sfdc header.b=abcefg; dmarc=pass (policy=quarantine) header.from=domaina.com; spf=pass (relay.mailrelay.com: domain of [email protected]_sender.com designates 1.1.1.1 as permitted sender) smtp.mailfrom=support=domaina.com__0-1q6woix34obtbu@823lwd90ky2ahf.mail_sender.com"));

Currently it throws with the following Exception:

MimeKit.ParseException: Invalid propspec token at offset 315
   at MimeKit.Cryptography.AuthenticationResults.TryParseMethods(Byte[] text, Int32& index, Int32 endIndex, Boolean throwOnError, AuthenticationResults authres)
   at MimeKit.Cryptography.AuthenticationResults.TryParse(Byte[] text, Int32& index, Int32 endIndex, Boolean throwOnError, AuthenticationResults& authres)
   at MimeKit.Cryptography.AuthenticationResults.Parse(Byte[] buffer)
   at Testing.Program.Main(String[] args) in D:\other code\C#\Testing\Testing\Program.cs:line 388
   at Testing.Program.<Main>(String[] args)

Expected behavior
I would expect the string to parse correctly.

[jstedfast]

= is a tspecial character which is technically not allowed :-\

[The-Nutty]

Yeah i did think it was very odd, thanks for the quick response.

[jstedfast]

No problem. Let me know if my work-around doesn't work for you. I made the code a lot more liberal in what it accepts.