Looking for a Replacement for Gmail when using Python on RaspPis

[/RaspberryPi]

Hi guys and gals,
I have some RaspPi3s that I am running a Python script on.
The script logs into a Gmail account and checks the inbox for certain filters and if it identifies emails with those filters it then runs it's code and deletes the email.
All these things work correctly, however, the only way to get this to work is to log into the Gmail account and turn off the secure apps setting in the google settings.
Turning the setting off then allows my script to log in properly.
However, Google arbitrarily re-enables the Secure app security setting in the account on its own and does not tell you when it does this.
Does anyone have a recommendation for an alternative free email service I can use that won't run into this problem?
Thank you,
In case people have questions;
Nothing is stored in the Gmail account it is just used to check for emails that are passed to it that relate to the filter my script checks.
I do not want to setup an email server on the Pi itself.

submitted by /u/Dregnox
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