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I suspect they would use different IP addresses for deliverability depending on a single or double opt-in subscription in order to manage that risk. That would
by stefan69 9y ago
I suspect they would use different IP addresses for deliverability depending on a single or double opt-in subscription in order to manage that risk. That would be the sensible think to do at least.
- CodeWriter23 9y agoThat might work against the primitive RBLs like SpamHaus, that rely on DNS-style blacklisting. In the world of carrier-grade email providers, they outsource spam scoring to one (or more) of a selection of about 3 vendors (Symantec, CloudMark come to mind). These systems also score against the sending domain, among a number of other factors. Source: my best friend is a lead engineer at a carrier-grade email provider. And playing whack-a-mole with changing sending domains is ill advised as that will lose the benefit of any whitelisting occurring client side.
- rlpb 9y agoWhat exactly is a carrier-grade email provider?
- CodeWriter23 9y agoISPs/free email at scale (Gmail, etc). Think billions of messages per day. Or where the majority of any audience of an email list receives their email.