That's a pity. I cannot remember anyone else telling me that it was spam filtered. But that doesn't have to mean anything.
Do you have any suggestions what I could improve to make these emails pass?
Do you have any suggestions what I could improve to make these emails pass?
You'll find a continuum of options for e-mail sending services. I'd pick the one that's most trusted within reason, not necessarily the "best deal." To me, it's an image thing: every time your e-mail ends in a Spam folder you let that user down a little. If they do find it, you've still disappointed them a little.