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test email server configuration

 

best general option

https://mxtoolbox.com/MXLookup.aspx

 

for gmail and google apps

https://toolbox.googleapps.com/apps/checkmx/

 

 

remember to setup dkim and dmarc, and consider that using dmarc policy reject or quarentine can cause some problems.

some say its better to use p=none , but make sure to think and through and make your own decision.

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