SMTP Settings Reference
Verified server, port, encryption, and authentication for every major mail provider. Each entry is sourced from the provider's official documentation and dated. If you're configuring a normal client, copy the row. If you're setting up cold email, the table tells you which providers belong nowhere near your outbound campaigns.
| Provider | SMTP Host | Port | Encryption | Daily Limit | Guide |
|---|---|---|---|---|---|
| Gmail | smtp.gmail.com | 587 | STARTTLS | 2,000 messages/day (smtp.gmail.com); 10,000 recipients/day per user (smtp-relay.gmail.com) | Full guide → |
| Office 365 | smtp.office365.com | 587 | STARTTLS (TLS 1.2+) | 10,000 recipients per day | Full guide → |
| Microsoft 365 | smtp.office365.com | 587 | STARTTLS (TLS 1.2+) | 10,000 recipients per day | Full guide → |
| Outlook.com | smtp-mail.outlook.com | 587 | STARTTLS | 300 messages per day (consumer accounts) | Full guide → |
| GoDaddy | smtpout.secureserver.net | 465 | SSL/TLS | 250 relays per day (Workspace/Professional Email base plans) | Full guide → |
| Zoho Mail | smtp.zoho.com | 465 | SSL/TLS | Varies by plan — typically 200/day for free, more for paid | Coming soon |
| Comcast / Xfinity | smtp.comcast.net | 587 | STARTTLS | 1,000 emails per day (per Comcast policy) | Coming soon |
| Twilio SendGrid | smtp.sendgrid.net | 587 | STARTTLS | Plan-dependent (Free: 100/day; paid plans scale to millions) | Coming soon |
| Hostinger | smtp.hostinger.com | 465 | SSL/TLS | Plan-dependent — typically a few hundred per hour on shared hosting plans | Coming soon |
Settings reflect each provider's official documentation as of May 2026. If a provider quietly changes a hostname or port, this table updates with it.
Full provider guides
Gmail
Consumer + WorkspaceGmail's SMTP server (smtp.gmail.com) on port 587 with STARTTLS or 465 with SSL. App password required when 2-Step Verification is on.
Office 365
Microsoft cloudOffice 365 (now branded Microsoft 365) uses smtp.office365.com on port 587 with STARTTLS. SMTP AUTH is disabled by default for tenants created after January 2020 and must be enabled per mailbox.
Microsoft 365
Microsoft cloudMicrosoft 365 (the rebrand of Office 365) uses smtp.office365.com:587 with STARTTLS and OAuth-preferred authentication. Basic Auth for SMTP submission is being retired.
Outlook.com
Microsoft consumerOutlook.com (the consumer mail service) uses smtp-mail.outlook.com:587 with STARTTLS. POP and IMAP are disabled by default and must be turned on in Outlook.com settings before any client can connect.
GoDaddy
Hosting + Workspace EmailGoDaddy Workspace / Professional Email uses smtpout.secureserver.net on port 465 (SSL) or 587 (STARTTLS). GoDaddy's Microsoft 365 plans use smtp.office365.com instead — the right value depends on which product you bought.
SMTP relays are the wrong tool for cold outreach
Every provider on this page caps daily sends in the hundreds or low thousands. Every one of them shares outbound IPs across thousands of other tenants. Every one of them tracks reputation at the domain or tenant level.
That's fine for personal mail, password resets, and order receipts. It's a deliverability disaster for cold outreach. The moment you push 500 cold messages a day through a single SMTP relay, the entire IP pool's reputation tanks and your messages start landing in spam alongside whatever the other tenants are doing.
Cold email at scale needs many sending domains, many low-volume inboxes, a 2:1 warmup-to-cold ratio enforced in your sequencer, and reputation isolation from your primary business domain. ScaledMail provisions and monitors that — real Google Workspace and Microsoft 365 inboxes on dedicated cold-email domains, ready to plug into Smartlead, Instantly, EmailBison, or PlusVibe.