PuzzleInbox vs Mailforge: Native Infrastructure vs Custom SMTP
Mailforge uses custom SMTP servers without Google/Microsoft IP authority. PuzzleInbox sends from official infrastructure.
Custom SMTP vs Google Workspace: A Fundamental Decision
Mailforge appeals to technical cold email operators who want full control through custom SMTP servers.
The IP Authority Gap
Google Workspace and Outlook 365 inboxes send through IPs with massive established positive reputation. Custom SMTP servers start with zero IP reputation and take weeks to months of careful warming.
| Feature | Puzzle Inbox | Mailforge |
|---|---|---|
| Infrastructure | Google Workspace + Outlook | Custom SMTP servers |
| IP reputation | Inherited from Google/MS | Built from zero |
| Setup complexity | Zero — done for you | High — requires expertise |
| Maintenance | None | Ongoing monitoring required |
| Time to first campaign | 24-48 hours | 2-6 weeks (IP warming) |
| Pre-warmed | ✓ | — |
| Best for | 95% of cold emailers | High-volume power users |
Verdict: Mailforge is a power user tool for specific high-volume use cases. For the vast majority of cold email operations, Puzzle Inbox native infrastructure delivers better deliverability from day one.