Common IMAP/SMTP hostnames and ports reference
Use this table when connecting a mailbox through Mailbox → Connect Mailbox → SMTP / IMAP. Values are the providers' published settings as of writing; check the provider's own documentation if a con…
Draft — written from product facts + domain knowledge; UI labels to be verified before publishing.
Use this table when connecting a mailbox through Mailbox → Connect Mailbox → SMTP / IMAP. Values are the providers' published settings as of writing; check the provider's own documentation if a connection fails.
General rules
- SMTP: port 587 with STARTTLS is the default. Port 465 with SSL/TLS is the alternative. Port 25 is for server-to-server mail and is usually blocked; do not use it.
- IMAP: port 993 with SSL/TLS. Port 143 (unencrypted or STARTTLS) is rarely needed.
- Username is normally the full email address unless stated otherwise.
- Password is an app password wherever 2-factor authentication is on.
Provider table
| **Provider** | **SMTP host** | **SMTP port** | **IMAP host** | **IMAP port** | **Username** | **Notes** |
| Gmail / Google Workspace | smtp.gmail.com | 587 (TLS) or 465 (SSL) | imap.gmail.com | 993 | full address | Prefer **Connect with Google** (OAuth). For SMTP use an app password (2-step verification required). Enable IMAP in Gmail settings. |
| Outlook.com / Microsoft 365 | smtp.office365.com | 587 (STARTTLS) | outlook.office365.com | 993 | full address | Prefer **Connect with Outlook**. SMTP AUTH and IMAP must be enabled per user; basic-auth SMTP may be blocked by tenant policy. |
| Zoho Mail | smtp.zoho.com (or smtp.zoho.eu / .in per data centre) | 587 (TLS) or 465 (SSL) | imap.zoho.com (or .eu / .in) | 993 | full address | Enable IMAP in Zoho Mail settings; use an app-specific password with 2FA. |
| Yahoo Mail | smtp.mail.yahoo.com | 587 or 465 | imap.mail.yahoo.com | 993 | full address | Generate an app password under Account Security. |
| iCloud Mail | smtp.mail.me.com | 587 (STARTTLS) | imap.mail.me.com | 993 | full address | App-specific password required. |
| SendGrid | smtp.sendgrid.net | 587 or 465 | — (no IMAP) | — | apikey (literal) | Password is the API key. Point IMAP at a real inbox for the same From address. |
| Mailgun | smtp.mailgun.org (or smtp.eu.mailgun.org) | 587 or 465 | — (no IMAP) | — | SMTP login from the Mailgun domain settings | Password is the SMTP password, not the API key. Pair with a separate IMAP inbox. |
| Amazon SES | email-smtp..amazonaws.com | 587 or 465 (also 2587/2465) | — (no IMAP) | — | SES SMTP username | Credentials are SES SMTP credentials generated in the console, not IAM keys. Pair with a separate IMAP inbox. |
| Icemail SMTP mailboxes | shown in Icemail on the mailbox | as shown (typically 587) | shown in Icemail on the mailbox | 993 | full address | Easiest path is **Mailbox** → **Connect Mailbox** → **Import from Icemail**, which fills these in automatically. |
| cPanel / web host | mail.yourdomain.com | 587 or 465 | mail.yourdomain.com | 993 | full address | Values vary by host; check the "Email accounts → Connect devices" page in cPanel. |
Encryption settings in OutreachFox
- Port 587 → choose TLS / STARTTLS.
- Port 465 → choose SSL.
- Port 993 (IMAP) → choose SSL.
Mismatching port and encryption is the single most common cause of a failed test connection.
Tips
- Transactional providers (SendGrid, Mailgun, SES) are built for volume, not cold email. They lack an inbox for replies and their shared IP pools can be reputation risks. Use them only if you know why; Google, Microsoft or Icemail mailboxes are the normal choice for outreach.
- Copy hostnames exactly; a trailing space or a typo such as "smpt" causes a DNS error.
- Keep a note of which data-centre region your provider assigned (Zoho .eu, Mailgun EU, SES region); using the wrong one returns an authentication error even with correct credentials.
Related articles
- Connect any SMTP/IMAP mailbox (custom provider)
- Bulk import sending accounts via CSV
- Fix mailbox disconnection errors (Google, Microsoft, SMTP)
- Microsoft 365: enable SMTP AUTH and IMAP for a user
- Buy domains and mailboxes through Icemail
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