I've been waiting for tens of minutes and then i find this thread seeing its been a problem since 2014...
https://forums.elderscrollsonline.com/en/discussion/137442/delays-while-receiving-in-game-mail-guild-store-and-other/p1
SpacemanSpiff1 wrote: »The fix is on ZOS's end. We can only work around it.
Edit:Interesting. So they deliberately made mails inconvenient. They pulled the same thing on guild banks to "fix" a duplicating bug.Sorry to burst those dreams for who think it might be fixed in a performance update: ZOS turned instant mail off intentionally because it was putting a lot of stress on the servers, causing a lot of lag. This was back in 2014, when performance was not as bad as now.
Sylvermynx wrote: »Log out, log back in. Takes less than a minute (for me.... YMMV).
Zoning works too