FWIW, partly inspired by this thread, I blogged about the week's Gmail fun here:
https://lightmeter.io/googledown-happens-every-day-for-mailops-admins/

Sam.

On 16/12/2020 15:34, Dr. Christopher Kunz via mailop wrote:
> Am 15.12.20 um 00:56 schrieb Bez Thomas via mailop:
>> Anyone else seeing repeated, but intermittent, 550-5.1.1s from Gmail for 
>> valid addresses?
>>
>> Diagnostic-Code: smtp; 550-5.1.1 The email account that you tried to reach 
>> does not exist. Please try
>> 550-5.1.1 double-checking the recipient's email address for typos or
>> 550-5.1.1 unnecessary spaces. Learn more at
>> 550 5.1.1  https://support.google.com/mail/?p=NoSuchUser
>>
> FWIW, this was acknowledged and marked as resolved by Google now [1], and has 
> been discussed elsewhere [2].
> 
> [1] 
> https://www.google.com/appsstatus#hl=en&v=issue&sid=1&iid=a8b67908fadee664c68c240ff9f529ab
> [2] https://news.ycombinator.com/item?id=25435916
> 
> Best regards,
> 
> 
> --ck
> 
> 
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