Cold outreach carries higher complaint risk. Isolating it protects the main domain's transactional and marketing reputation.
Mistake 1: Sending cold mail from the primary company domain#
Why it hurts: this undermines cold email infrastructure at the point where mailbox providers make their decision, and it is rarely surfaced by your own tooling until placement drops.
Fix: Register 2 to 5 lookalike domains and redirect them to your main site.
Mistake 2: Skipping DMARC on secondary domains because 'they do not matter'#
Why it hurts: this undermines cold email infrastructure at the point where mailbox providers make their decision, and it is rarely surfaced by your own tooling until placement drops.
Fix: Set up SPF, DKIM, and DMARC on every domain from day one.
Mistake 3: Buying aged domains with unknown history#
Why it hurts: this undermines cold email infrastructure at the point where mailbox providers make their decision, and it is rarely surfaced by your own tooling until placement drops.
Fix: Create 2 to 3 mailboxes per domain and warm each for 3 to 4 weeks.
Frequently asked questions#
How many emails can I send per mailbox per day?
Google Workspace allows 2,000, but for cold outreach 30 to 50 keeps you under behavioral thresholds.
Should I use Google Workspace or Microsoft 365 for cold email?
Both work. Workspace mailboxes tend to warm faster; Microsoft has stricter outbound spam filtering.