gmail occasionally bouncing list email

[mick crane <mick.crane@gmail.com>]

hi,
gmail sometimes bounces email from list.
Occasionally is spam that got through list server but last one was 
genuine that was bounced because of DMARC or something.
I can't see a way to whitelist list domain before it gets to the filters 
at gmail.
Any suggestions ( apart from not using gmail ) ?

mick

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