Error using gmail smtp

Hi guys, I have been starting with novu and I love the developer experience so far !!

Do you have some feedback with the use of gmail smtp ?
I get random errors like the following
421 4.3.0 Temporary System Problem. Try again later (10). c19-20020a05620a165300b0073b878e3f30sm640124qko.59 - gsmtp

I have enabled DKIM encryption and all the advice from google to get better deliverability rates but I hit this error a lot...

Thank you so much for helping in advance,

Happy mailing
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