How to set Content-ID to attached file?

[dmitam]

Is your feature request related to a problem? Please describe.

I need to set Content-ID to use attached image inside the html content. I tried to SetGenHeader on message but it affects all the parts.
Seems to be related with #107

Describe the solution you'd like

Another option WithContentId or WithHeader in EmbedFile or AttachFile

Describe alternatives you've considered

No response

Additional context

No response

[wneessen]

Hi @dmitam,

thanks for opening this report. You can actually already do the requested feature with go-mail right now.

Embed your image file like this:

m := mail.NewMsg()
[...]
m.EmbedFile(fn, mail.WithFileName("my_logo.png"))

and in the mail body, then refer to the filename via the oid: keyword:

<img src="cid:my_logo.png" alt="My great Logo" width="150px"/>

The mail client will then inline the logo as expected directly into the mail's html context.

[dmitam]

Thank you! It helped