Google Workspace vs Microsoft 365 for cold sending

Google Workspace vs Microsoft 365 for cold sending

The mailbox provider you buy decides half your deliverability before you write a word.

Google Workspace Pros:
— More forgiving spam filters toward other Gmail inboxes
— Easier API for warm-up tools to authenticate
— SPF/DKIM/DMARC setup is well-documented

Google Cons:
— Aggressive on bulk patterns; suspends fast
— ~$6/mailbox before discounts

Microsoft 365 Pros:
— Cheaper at scale via reseller plans
— Lands well in other Outlook/corporate inboxes
— Tolerates slightly higher per-mailbox volume

Microsoft Cons:
— Notorious for silent throttling and IP reputation drama
— OAuth setup for sequencers is fiddly

Verdict: Google 4/5 for B2C-flavored lists, Microsoft 4/5 when your targets are enterprise.

Who it's for: Match the mailbox to the recipient. Selling to startups on Gmail? Google. Selling to corporates on Outlook? Microsoft. Mixing both with separate sending pools beats forcing one provider everywhere.