Just yesterday while checking what I'd get in the conversion of STF loot, I also noticed none of the items that are attached to the couple mails I send from one toon to another appear.
First I checked that it happens in sector space, without direct access to mail (console or freighter).
Then I called in the S.S. Vov'wI which should grant direct access to both sending items and receiving them. Sadly, even when I clicked on the "mail" option on the S.S. Vov'wI's interface, the attached items still didn't appear. I couldn't see the items nor the button by which I could claim them.
TOIVA, Toi Vaxx, Toia Vix, T'vritha, To Vrax: Bring in the Allegiance class Toi'Va, Ti'vath, Toivia, Tia Vex, Toi'Virth: Add Tier 6 KDF Carrier and Raider. Tae'Va, T'Vaya, To'Var, T'Vira, To'Vrak: Give us Asylums for Romulans