- Google - OAuth. A Google Workspace admin trusts the Fuse app once per domain; after that, every mailbox on the domain connects in two clicks and can send campaigns.
- Outlook - OAuth. Sign in with Microsoft and approve the requested permissions. This is the only way to connect a Microsoft mailbox (see Microsoft 365).
- Other (SMTP / IMAP) - any other provider: custom domains, Zoho, Yahoo, iCloud, cPanel hosting, or a Google mailbox you prefer to connect with an app password.
Prefer the OAuth options for Google and Microsoft: there are no app passwords to manage, and Microsoft mailboxes can only connect this way.
The SMTP / IMAP form
Picking your provider in the form fills the hosts and ports automatically. The sections below show where to create each provider’s app password.
Gmail
Google mailboxes need an app password; your normal password won’t work over SMTP/IMAP.1
Turn on 2-Step Verification
App passwords only exist when 2-Step Verification is on: myaccount.google.com/security.
2
Create the app password
Go to myaccount.google.com/apppasswords, enter a name like
Fuse, and click Create. Google shows a 16-character password once; copy it.3
Paste it into Fuse without spaces
Google displays it in groups (
xxxx xxxx xxxx xxxx); remove the spaces when pasting.smtp.gmail.com:465 (TLS on) · IMAP imap.gmail.com:993 (TLS on).
On Google Workspace, the admin must allow 2-Step Verification and keep IMAP enabled for the organization.
Microsoft 365
Microsoft mailboxes cannot connect over SMTP / IMAP. Microsoft retired the basic authentication these connections rely on (September 2024 for personal accounts, April 30, 2026 for Microsoft 365 SMTP sending), and app passwords for mail stopped working with it. Connect Microsoft mailboxes with the Outlook option in Add Account instead.Yahoo Mail
1
Generate an app password
Open Yahoo Account Security, choose Generate and manage app passwords, and name it
Fuse.smtp.mail.yahoo.com:465 (TLS on) · IMAP imap.mail.yahoo.com:993 (TLS on).
Zoho Mail
1
Enable IMAP access
Zoho Mail → Settings → Mail accounts → IMAP → enable IMAP access. It’s off by default.
2
Use the right password
If Two-Factor Authentication is on, create an app-specific password at accounts.zoho.com → Security → App Passwords. Without 2FA, your regular password works.
smtp.zoho.com:465 (TLS on) · IMAP imap.zoho.com:993 (TLS on).
Zoho accounts hosted in other regions use that region’s hosts, e.g.
smtp.zoho.in / imap.zoho.in for India and .eu for Europe. Match the domain you sign in with.Apple iCloud
iCloud always requires an app-specific password for third-party mail apps, and your Apple ID must have two-factor authentication on.1
Generate an app-specific password
account.apple.com → Sign-In and Security → App-Specific Passwords → +.
smtp.mail.me.com:587 (TLS off, STARTTLS) · IMAP imap.mail.me.com:993 (TLS on).
Fastmail
Fastmail always requires an app password for IMAP/SMTP; your account password won’t work in third-party apps.1
Create an app password
Fastmail → Settings → Privacy & Security → Integrations → New app password. Choose Mail (IMAP/SMTP) access.
smtp.fastmail.com:465 (TLS on) · IMAP imap.fastmail.com:993 (TLS on).
GoDaddy
GoDaddy mailboxes use your regular mailbox password; no app password is needed. Server settings: SMTPsmtpout.secureserver.net:465 (TLS on) · IMAP imap.secureserver.net:993 (TLS on).
If your GoDaddy email plan is actually Microsoft 365, see Microsoft 365 and connect with the Outlook option.
cPanel / custom domains
Your host’s webmail or cPanel shows the exact settings under Email Accounts → Connect Devices. Typically:- SMTP:
mail.yourdomain.com:465(TLS on) - IMAP:
mail.yourdomain.com:993(TLS on) - Username: the full email address
- Password: the mailbox password set in cPanel
Troubleshooting
Use Test connection in the form before connecting; it verifies both SMTP and IMAP with the details you entered.