Auto-deletion on Premium email

[jeccles2]

Can someone explain if and when emails are auto-deleted from the trash folder?  Are there nay settings that can be adjusted to control it?

Thanks

[licquorice]

There are no settings to adjust within the BT webmail. Any mail clients you are using may,however, have adjustable settings.

I really can't get my head around using the trash folder as a storage folder.

If you don't want an email, delete it. If you want to keep it, file it. If you are not sure, put it in a pending folder.

Do you rummage in your dustbin for items you have thrown out?

[jeccles2]

Thank you Liquorice for taking the trouble to reply. 
You may have misunderstood my question: I was not intending to use my Trash folder for storage. My question was prompted because all my emails in Trash older than about two weeks have disappeared - I was simply trying to understand why.