A unified inbox (unibox) consolidates replies from many mailboxes into one intent-sorted view, so one operator can answer hot leads fast without account-switching.
AB testing in cold email compares two variants on real prospects to find which converts. Test one element, judge on reply rate, and scale the winner.
A subsequence is a conditional follow-up path triggered by a prospect's behavior. It branches outreach by intent, making sequences responsive instead of rigid.
Spintax is variation syntax that turns one email template into many unique versions. It protects deliverability at scale, working alongside personalization and warmup.
A cold email sequence is a first email plus timed follow-ups that pauses on reply. Most replies come from the follow-ups, so the sequence turns outreach into pipeline.
A custom tracking domain is a branded CNAME that routes your open and click tracking links, isolating their reputation from shared domains and protecting deliverability.
Dedicated IP explained: how a sending IP used only by you isolates reputation, when high-volume cold email needs one and when it does not.
Secondary domain explained: why cold email senders use a separate sending domain to protect their main domain, and how to set one up safely.
Mailbox rotation explained: how spreading volume across many mailboxes keeps each domain safe, looks organic and lets cold email scale.
How long to warm up an email account before cold email: typically one to two weeks, what changes the timeline and how to tell when ready.
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