Note to self (hence the blog post) - I've seen this before but didn't write it down.
Incoming traffic arrives in inbox. Said traffic visible via WEBMAIL. Use RMS EXPRESS to download traffic for mailbox.
a day later, traffic downloaded still in webmail inbox. (in this paticular case NNN0HHO 090 TO NNN0ALC).
Thanks to Jack NNN0BQW for for pointing this out this time.