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Intervalli di indirizzi IP di Google per SMTP in uscita

Quando configuri l'email per il tuo dominio (ad esempio i record SPF), potresti avere bisogno di conoscere gli indirizzi IP dei server della posta di G Suite.

Google gestisce un'infrastruttura globale che cresce dinamicamente per venire incontro alla domanda. Di conseguenza, i server della posta di G Suite utilizzano un ampio intervallo di indirizzi IP e gli indirizzi cambiano spesso. Puoi individuare l'intervallo di indirizzi IP di Google in uso in un dato momento controllando il record SPF di Google.

Per creare un record SPF per il tuo dominio, è sufficiente che il record faccia riferimento al record SPF di Google. Il dominio eredita automaticamente le modifiche degli indirizzi IP di Google.

v=spf1 include:_spf.google.com ~all

Per gli indirizzi IP letterali dei server della posta di G Suite, utilizza i comandi di ricerca DNS (nslookup, dig, host) per recuperare i record SPF per il dominio _spf.google.com:

nslookup -q=TXT _spf.google.com 8.8.8.8

Verrà restituito un elenco dei domini inclusi nel record SPF di Google, quali ad esempio:
_netblocks.google.com, _netblocks2.google.com, _netblocks3.google.com

A questo punto puoi cercare singolarmente i record DNS associati a tali domini:

nslookup -q=TXT _netblocks.google.com 8.8.8.8 nslookup -q=TXT _netblocks2.google.com 8.8.8.8 nslookup -q=TXT _netblocks3.google.com 8.8.8.8

I risultati contengono l'intervallo di indirizzi corrente.

Nota: questi netblock includono anche gli indirizzi IP per tutti gli altri servizi di G Suite (ad esempio docs.google.com o drive.google.com). Tuttavia, poiché la posta può essere fornita da qualsiasi punto dell'infrastruttura di Google, è importante includere tutti questi record.

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