[net.mail] ReadMessage returns nil, io.EOF when email w/o body.

[Karan Gupta]

Hello Everyone

RFC 5322 (https://www.rfc-editor.org/rfc/rfc5322#section-3.5) allows for messages without bodies.

` A message consists of header fields, optionally followed by a message body `

However, the net/mail . ReadMessage returns an error when an email does not contain a body.
To demonstrate this I have written a small program (attached) that shows the difference in values returned by mail.ReadMessage when the input email message ends in
1. a 'field' where field is defined as in RFC5322. with focus on the fact that 'field' ends in  a single CRLF

2. a body. In this specific case, I have chosen to use an empty body. Email is constructed by appending 2 consecutive CRLFs to the message from (1). The first CRLF is to separate the header from the body and the second to terminate an empty body

Is this a bug in the go standard library?

-Karan

[Ian Lance Taylor]

I think you are describing https://go.dev/issue/33823, which, as it
happens, is fixed in the upcoming Go 1.21 release.

Ian

[Karan Gupta]

That is correct. It is the same issue. 

Thanks for the help.

-Karan

[Jim Idle]

If you are doing any serious email work, you might find that the enmime module is useful.  

https://github.com/jhillyerd/enmime

And perhaps this:

https://github.com/gatherstars-com/jwz

Jim

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[Karan Gupta]

Thanks will try the library shortly. Looks good

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