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This list is probably incomplete / out-of-date but ... 149.72.0.0/16 167.89.0.0/17 168.245.0.0/17 192.254.112.0/20 198.21.0.0/21 198.37.144.0/20

• jeffbee 6y ago
  Isn't their SPF record authoritative? ip4:167.89.0.0/17 ip4:208.117.48.0/20 ip4:50.31.32.0/19 ip4:198.37.144.0/20 ip4:198.21.0.0/21 ip4:192.254.112.0/20 ip4:168.245.0.0/17 ip4:149.72.0.0/16
  • jlgaddis 6y ago
    Usually, yeah, but not necessarily (e.g., for those with dedicated IP addresses). Even then, it usually will be since most customers will just add the (customer-specific) "include:nnn.wl.sendgrid.net", or even just "include:sendgrid.net". But, for whatever reason, I've come across several that add an "a:" or "ip4:" for their dedicated IPs instead (I assume there's a good reason for that, but I don't know what it is).
    • megous 6y ago
      Probably so that they can also send some mail from their own servers, in addition to sendgrid's.