In my SMTP Activity log i see this:
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06/16/13 23:24:13 SMTP-IN 3FA4BB103D274E6BAF7004AA7AEFCCF7.MAI 976 209.85.220.178 EHLO EHLO mail-vc0-f178.google.com 250------------ [209.85.220.178], this server offers 5 extensions 151 31
06/16/13 23:24:14 SMTP-IN 3FA4BB103D274E6BAF7004AA7AEFCCF7.MAI 976 209.85.220.178 MAIL MAIL FROM:<-----------> 250 [SMTP:-----------] OK. 33 30
06/16/13 23:24:14 SMTP-IN 3FA4BB103D274E6BAF7004AA7AEFCCF7.MAI 976 209.85.220.178 RCPT RCPT TO:<-----------> 250 OK 8 26
06/16/13 23:24:14 SMTP-IN 3FA4BB103D274E6BAF7004AA7AEFCCF7.MAI 976 209.85.220.178 DATA DATA 354 OK 8 6
06/16/13 23:24:14 SMTP-IN 3FA4BB103D274E6BAF7004AA7AEFCCF7.MAI 976 209.85.220.178 UNKN Received: by mail-vc0-f178.google.com with SMTP id m17so1679980vca.23 503 Bad sequence of commands 30 1490
06/16/13 23:24:14 SMTP-IN 3FA4BB103D274E6BAF7004AA7AEFCCF7.MAI 976 209.85.220.178 UNKN for <----------->; Sun, 16 Jun 2013 23:24:14 -0700 (PDT) 503 Bad sequence of commands 30 0
06/16/13 23:24:14 SMTP-IN 3FA4BB103D274E6BAF7004AA7AEFCCF7.MAI 976 209.85.220.178 UNKN DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; 503 Bad sequence of commands 30 0
06/16/13 23:24:14 SMTP-IN 3FA4BB103D274E6BAF7004AA7AEFCCF7.MAI 976 209.85.220.178 UNKN d=gmail.com; s=20120113; 503 Bad sequence of commands 30 0
06/16/13 23:24:14 SMTP-IN 3FA4BB103D274E6BAF7004AA7AEFCCF7.MAI 976 209.85.220.178 UNKN h=mime-version:date:message-id:subject:from:to:content-type; 503 Bad sequence of commands 30 0
On a few other emails, I received a "504 Unrecognized authentication type" error.
Also, in the SMTP debug log i have this:
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06/16/13 23:28:44 SMTPMsgMAIL raised an exception.
The exception occured in : .\SMTPInboundMessages.cpp, line 2897
06/16/13 23:28:44 ProcessSMTPMessage handled an exception; session will be dropped.
Command: MAIL FROM:<----------->
06/16/13 23:28:44 SMTPMsgRCPTTO raised an exception.
The exception occured in : .\SMTPInboundMessages.cpp, line 3226
06/16/13 23:28:44 ProcessSMTPMessage handled an exception; session will be dropped.
Command: RCPT TO:<----------->
Any ideas what this could be?