Note: On creating this post in the Zen Cart forum, clicking Preview completely erased the post so I had to start again. Argh.

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Recently "order confirmation email" sent from Zen Cart began getting marked as spam. In the email headers I note two new spam score entries.

XPRIO ("Has X-Priority header")
KAM_ASCII_DIVIDERS ("Spam that uses ascii formatting tricks")

I assume I can edit phpmail library code so the XPRIO header is not added to email sent from Zen Cart. And that I can alter the formatting of email sent from Zen Cart to avoid the KAM_ASCII_DIVIDERS score.

I was not aware of this issue until after upgrading to ZC 1.54

Any recommends?

Note the store is configured to sent only TEXT formatted email.

Thanks.