What does "Use Recent Mode" Mean?

[thinkart]

in mail settings when you go to advanced...the last option is "Use Recent Mode" and toggles on/off
Anyone know what this is for?

 

[hoop]

where is this again? i don't see this option on my phone

 

[thinkart]

settings>mail>select an email acct (yourname@youremail.com)>advanced
use recent mode is the last setting on the list

 

[chrisaka]

Recent mode will fetch the last 30 days of messages, even if they have already been fetched by another client.

Chris