NullReferenceException unsing IMAP and Digest-MD5

[ckopas]

Hi Jeff,

I have a problem using IMAP and DIGEST-MD5 with my E-Mail Provider STRATO, because I get a NullReferenceException during authentication. If I remove the authentication mechanism "DIGEST-MD5", everything works well.

I have looked into the code and I think the problem is within the constructor of the class DigestResponse (file MailKit.Security.SaslMechanismDigestMd5.cs), because in my case the value of challenge.Realms of the parameter challenge is null. Therfore the if-statement at the beginning

if (challenge.Realms.Length > 0)

casues the exception. If I change the statement to

if ((challenge.Realms != null) && (challenge.Realms.Length > 0))

the authentication process succeed.

[jstedfast]

Thanks for reporting and digging into this!