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https://issues.apache.org/jira/browse/EMAIL-142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14153708#comment-14153708
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Marcin Tomiak commented on EMAIL-142:
-------------------------------------
Try to download this email via IMAP.
As long as you don't click on the message in inbox (and thus read it), Mozilla
Thunderbird will show attachment icon (because it read from header that this is
multipart/mixed).
Please refer to: http://tools.ietf.org/html/rfc2046#section-5.1.4
If the message has alternative representations of the message, and there is no
attachment, than main content-type should be multipart/alternative (not
multipart/mixed).
> HtmlEmail with both html and text provided has invalid content-type
> --------------------------------------------------------------------
>
> Key: EMAIL-142
> URL: https://issues.apache.org/jira/browse/EMAIL-142
> Project: Commons Email
> Issue Type: Bug
> Affects Versions: 1.3.2
> Reporter: Marcin Tomiak
> Fix For: 1.3.3
>
> Original Estimate: 0.25h
> Remaining Estimate: 0.25h
>
> If I set both html and plain text for HtmlEmail i.e.:
> email.setHtmlMsg(htmlMessage);
> email.setTextMsg(plainTextMessage);
> then message which is sent has Content-type: multipart/mixed;
> This content type is recognized for example by Mozilla Thunderbird as a
> message with attachment.
> Correct content-type for this kind of email is Content-type:
> multipart/alternative;
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