One of my test e-mails had a negative id in the Received header added by Purelymail. This isn't necessarily a bug as the id field doesn't have a defined format, but it appears an unsigned value may be being output as signed and this could lead to issues tracking mail through the system.
E.g.
Received: by smtp.purelymail.com (Purelymail SMTP) with ESMTPA id -243384252
One of my test e-mails had a negative id in the Received header added by Purelymail. This isn't necessarily a bug as the id field doesn't have a defined format, but it appears an unsigned value may be being output as signed and this could lead to issues tracking mail through the system.
E.g.
Received: by smtp.purelymail.com (Purelymail SMTP) with ESMTPA id -243384252