patchbomb: Reply-To support From RFC 5322: an optional reply-to field MAY also be included, which contains the field name "Reply-To" and a comma-separated list of one or more addresses. [...] When the "Reply-To:" field is present, it indicates the address(es) to which the author of the message suggests that replies be sent. In the absence of the "Reply-To:" field, replies SHOULD by default be sent to the mailbox(es) specified in the "From:" field unless otherwise specified by the person composing the reply. Reply-To addresses may be specified either via command line with --reply-to or via the 'email' or 'patchbomb' sections of the config file.