I have a series of transformers that creates a jpg via a VectorOnRasterOverlayer and FeatureWriter, which stores the jpg on a file server. The jpg is then pushed through a HTMLReportGenerator and then to an Emailer. We use GMail and apparently, Gmail doesn't like embedded images that are sourced from a file server. I get the "broken icon" in the email (and no inline image).
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Can anyone comment on what I am doing wrong? Any help would be greatly appreciated.
There's an increasing amount of hoops to jump to use Gmail as a mail gateway (not only for FME), I suspect it is due to spam/abuse. I really recommend asking your ISP, they can often provide the same services for a modest price, but with a lot less restricitions. Sometimes your IT department may already have an SMTP relay server available for internal purposes, which allows you to send mails from your own domain.
If not, there are several dedicated SMTP gateway providers out there, some of them are even free if you're below a certain treshold, e.g. https://sendgrid.com/pricing/