SCreenshot. It's imap btw.

In the future, Can I stop it once initiated?

No.

zach6 said

In the future, Can I stop it once initiated?

No.

Okay, thank you. I'm surprised there's not just a simple cancel button, like when doing file transfers on a computer.

You are not copying files, you are synchronizing a folder of mail to the server. To be honest not even similar functions.

Given the original intent of IMAP synchronization is focused on automation and generally bringing the local copy in line with the server on login such niceties as offing you the chance to decide you did something silly is not in the specification. The specification is located here. https://www.ietf.org/rfc/rfc2060.txt

Perhaps one of the great oddities of life is the common complaint it the huge uploads regularly silently fail and loose mail, not that they can not be stopped.

True, I understand that was not the intent of imap.

In my case I'm actually hand selecting select folders/files by keywords and copying/syncing them to the server, it's not a 1 for 1 synchronization of the local folders. More of a Mix mash of things I wanted to upload to the server.

Seriously, it should not block anything, you should still be able to get mail and send it while the transfer occurs. It should even recover from a shut down and restart. (but it might not)

Hey thanks for the super helpful reply. I'm not sure how I missed that thread. I haven't quite mastered the search function on here. The Information you shared above is great. I have been reading all you shared here. In this you explained everything very well. Thanks I am going to bookmark this https://support.mozilla.org/en-US/questions/1356819-results.

Thanks Again