Pro's/cons of either setup via the HTC client?

I currently have it set up using IMAP, but then I can't access email via WiFi.

Yahoo doesn't support IMAP Idle, so it can't simulate push mail. Therefore you need to set a frequency for it to poll.

I was thinking of switching to SMTP so that I could use it at home via wifi. I already have the IMAP poll frequency set to 1 hour, and could do the same with SMTP.

Is there a good reason to stick with IMAP rather than SMTP?

 

Yes absolutely correct. I wasn't thinking straight. I am trying to decide if I should change from IMAP to POP3 since I am a Plus subscriber and with POP3, could access my email via wifi.

 

That's true. So when I manually delete an email from the Incredible, it will delete it from the server as well so that I am not getting that email again on my computer.

That is probably enough reason for me to stick with IMAP and deal with the inconvenience of not being able to use wifi to get my Yahoo mail.

 

That option isn't typically used for manual deletion of email. The way I have always understood that option to work is that the email client (Incredible in this case), would download your mail from the server. It would also delete it from the server by default since the email is now sitting on your client. But checking that option allows you to then go to your computer and also download that email. This is the way I always configured mine.

Edit - therefore manually deleting an email from within the HTC client only deletes it from the device no matter the setting above.

 

I don't think that's the way it works. Deleting it from the phone by reading the email, and selecting "delete" from the menu will delete it ONLY from the phone, never from the server.

Failing to tick the checkbox that says "leave a copy on server" means that when the phone downloads the email to the phone, it will also delete the email from the server, automatically, every time, before you ever read the email. Ticking that checkbox means that when the phone downloads the emails, it won't tell the server to delete them.