Email warm-up
Grey hat. Allowed in some places and easy to abuse. Check the rules first. Where outreach turns into spam
What is email warm-up?
Email warm-up is the practice of starting a new sending domain or mailbox with a small number of emails and increasing volume gradually over weeks. Mailbox providers treat sudden high volume from a new sender as suspicious, so a slow start builds reputation.
Some services automate warm-up by exchanging emails between their users and marking them as read or important; that practice is debated, because it imitates engagement rather than earning it.
Why email warm-up matters
Sending hundreds of emails on day one from a new domain is a fast route to the spam folder. Warming up protects deliverability.
Risks of email warm-up
- Automated warm-up networks that fake opens and replies can be seen by mailbox providers as manipulation.
Related marketing terms
Email deliverability is how reliably your emails reach the inbox rather than spam, shaped by authentication, reputation and content.
An SPF record is a DNS entry listing which servers may send email for your domain, so receivers can reject forged messages.
DKIM (DomainKeys Identified Mail)
DKIM adds a cryptographic signature to your emails, published in DNS, so receivers can verify the email came from your domain unaltered.
Cold emailWhite hat
A cold email is a first message sent to someone you have no prior relationship with, to start a business conversation. It must follow anti-spam law.