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DML2020DML2020 

Relevant IP addresses for email test deliverability

After executing the test deliverability feature in Salesforce I received the message that 16 messages have been sent to my email address. 

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If Salesforce sends a test email from the relevant IP addresses to my address but I could EXPECT up to 32 emails,
1. how are those 16 IP addresses determined to be relevant
2. what about the other 16, should I have received them? if so, how do I resolve this?
3. where can I find the list of those relevant IP addresses?

Trying to better understand deliverability.
 
VinayVinay (Salesforce Developers) 
Check Email logs you should be able to see details.

https://help.salesforce.com/articleView?id=sf.email_logs_edit.htm&type=5

Thanks,