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Fastmail as well. I just paid for 3 years which amounts to 3.11 USD or so, per month.

May I ask what Thunderbird local storage means? Does that mean that emails are delivered and stored on the device, vs on a cloud server?

What address did the email come from, and what do the headers show? Anything to indicate it's a spoofed email?

Very much this. I see users getting locked out of Google account often, or Google changing their policies (like the recent change of free G Suite accounts to premium ones) which wo…

I am not aware of any truncation, but best to ask their support and/or ask on their community forums.