Currently if you send an invoice by email using a html template there is no plain text alternative included, this counts against you on most spam filters (e.g. spamassassin has the rule MIME_HTML_ONLY). Most online mail services e.g. mailchimp have an option to include the plain text alternative, this would be very helpful in cutting down on the number of invoices that get falsely marked as spam especially with the proliferation of fake invoices that are around these days.
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