Deliverability measures whether your email actually lands in the inbox, not just whether the receiving server accepted it.
Key points
- Delivery and deliverability differ: a message can be accepted by the receiving server and still be filed as spam, which is the gap that Inbox Placement measures.
- Gmail requires every sender to set up SPF (Sender Policy Framework) or DKIM (DomainKeys Identified Mail), keep valid forward and Reverse DNS (PTR Record), use TLS and keep the reported spam rate below 0.3% [1].
- Bulk senders, defined by Gmail and Outlook as more than 5,000 messages a day, must also publish DMARC and align the From domain, and Gmail and Yahoo also require One-Click Unsubscribe [1][2][3].
- Sender Reputation is built from complaint rates, Bounce Rate, Spam Trap hits and engagement, and it follows both the domain and the sending IP.
- Sudden jumps in volume hurt deliverability; Google advises starting low and increasing volume slowly while watching error rates and spam rate [1].
- Tools such as Google Postmaster Tools show how one mailbox provider sees your traffic, including spam rate and compliance status [4].
What decides whether an email reaches the inbox
Mailbox providers make a placement decision for every message. First they check identity: does the message pass SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail) and DMARC, and does the sending IP have a matching Reverse DNS (PTR Record) entry? Then they weigh history. A domain with low complaints, few bounces and steady volume earns trust, while one that sends to stale lists or triggers user spam reports loses it. Finally the Spam Filter scores the content, from links to promotional wording, and the recipient's own behavior, such as whether they usually open, reply to or delete mail from this sender. Gmail's published guidelines list the technical minimums for all senders and stricter rules for bulk senders, and they state that meeting them does not guarantee inbox placement [1]. Deliverability is the combined result of all these signals, not a single setting.
Deliverability for cold email
Cold Email is harder to deliver than newsletters because recipients have never heard from the sender and have no habit of opening the mail. That makes list quality and restraint the main levers. Verifying addresses before sending keeps the Bounce Rate low, and removing Role-Based Email Address addresses and risky Catch-All Email Address domains cuts wasted sends. Short, relevant Plain-Text Email messages sent in modest daily volumes look like normal person-to-person mail. Yahoo's sender guidance makes the same points in general form: authenticate, keep complaint rates low and honor unsubscribes promptly [2]. Many teams also send outreach from a Secondary Sending Domain so that any reputation damage does not reach the company's main domain. None of this replaces relevance: messages that recipients mark as spam will sink any setup.
How PineLead approaches deliverability
PineLead sends from the user's own connected mailbox, so messages go out through the same provider the user already uses for everyday mail, with that provider's authentication. PineLead keeps a daily sending limit, which spreads outreach over time instead of sending it in bursts, in line with Google's advice to send at a consistent rate [1]. Because each prospect is scored against the user's Ideal Customer Profile (ICP) before any draft is written, rejects never get an email, which keeps volume focused on people likely to care. Users can approve each draft or turn on Auto-Approve for fitting prospects. Microsoft's requirements for high-volume senders, which took effect in May 2025, are another reason to keep volume moderate and authentication complete [3].
Related terms
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