Re: Send mail with attachment using only SMTP

[almut]

there is an attachment, but it is almost empty, unreadable file

If you look at the raw mail message, does it look like you would expect?

$smtp->datasend("Content-type: multipart/mixed;
boundary=\"frontier\"\n");

Is that line wrap after multipart/mixed; just an artifact of cut-n-pasting, or is that in your actual code like this? (hint: the Content-type header should be one line)

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(BTW, if you closed your code tags like this </code>, you wouldn't have the problem with [$_] being turned into links... :)