How to change or delete headers

[ramprasadp]

How to change or delete headers

We are doing e.Parseheaders and e.Set("someheader")

But e.String. is not updated with the new header
Does this need to be committed back to the original content

[pkarc]

Hey @ramprasadp I just take a look to https://github.com/phires/go-guerrilla/blob/master/backends/p_header.go this Generates de MTA delivery header. You could use this processor as a base to what you want to acheive .

Also looking at Envelope, the e.String concatenates the DeliveryHeader that gets filled by p_header.go prosessor.

// Len returns the number of bytes that would be in the reader returned by NewReader()
func (e *Envelope) Len() int {
	return len(e.DeliveryHeader) + e.Data.Len()
}

// NewReader returns a new reader for reading the email contents, including the delivery headers
func (e *Envelope) NewReader() io.Reader {
	return io.MultiReader(
		strings.NewReader(e.DeliveryHeader),
		bytes.NewReader(e.Data.Bytes()),
	)
}

// String converts the email to string.
// Typically, you would want to use the compressor guerrilla.Processor for more efficiency, or use NewReader
func (e *Envelope) String() string {
	return e.DeliveryHeader + e.Data.String()
}

Let me know if this gives you a clue on how to resolve it

[ramprasadp]

But How can I update e.DeliveryHeader after setting a header or deleting a header

Is there a method that recreates the header string