Delete trash / sent emails after 30 days

[Alyssa74]

I have a Mac, using Catalina, and have used Mail for quite some time. I'm also using the IMAP configuration, and previously was using POP. Does anyone know if it's possible either in Mail or on Webmail to set a filter up to delete the trash and sent mailboxes after a certain amount of time? ie 30 days. I swear when I had Outlook on a Windows machine I could do this.
Thanks for your time.

[mdk · Accepted solution]

@Alyssa74 -- from the Apple Support site: 

Decide how long to keep deleted emails

You can set how long deleted emails stay in the Trash mailbox.

1. Go to Settings -> Passwords & Accounts. 

2. Tap your email account, tap Mail (below Advanced), then tap Advanced.

3. In the Advanced settings, tap Remove, then select a time interval.

Note: Some email services might override your selection;

for example, iCloud doesn’t keep deleted emails longer than 30 days, even if you select Never.

[Alyssa74]

Thanks, but I need it for the laptop/desktop Mail program. Not my phone. Although my phone does sync to the server as well. From the adjustments I've made it does seem to respond to the server Trash folder on my desktop, but I have another trash folder called "On my Mac" which it doesn't respond to.  Oh technology.