Sorry if this reply appears twice but I couldn't see the first one.
No, the books I'm sending are not DRM'd. Have been sending them successfully for yars to both myself and friends. I can still successfully send them via my email client .. and via my webmail, both of which use my default webmail address. Just calibre not sending.
Also, I haven't changed any of my calibre "sending" details and still all worked perfectly well till yesterday evening when I and a few friends didn't get what I sent. I'm stumped as to what's caused the sudden stop.
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