Which mailer should I use?

BooleanSMTP sends through five mailers. Most sites fit one of three situations:

• Your business email is on Google Workspace or Microsoft 365. Send through that account: you connect by signing in.
• Your site sends a lot — shop orders, memberships, newsletters. Use Amazon SES, a sending service built for volume.
• Your host or mailbox gives you SMTP details. Use Custom SMTP.

PHP Mail is WordPress’s default sending, with no provider behind it — a last resort rather than a choice.

Find your fit

Pick an answer to each question; the list re-orders as you go, and the top three say why.

1. Google WorkspaceAPI (sign in with Google) or SMTP
2. Microsoft OutlookMicrosoft Graph API (sign in with Microsoft)
3. Amazon SESAPI or SMTP
4. Custom SMTPSMTP
5. PHP MailWordPress default mail

Each card opens that mailer’s setup guide. The full list is on Mailers.

Check yourself

Which mailers send over an API in BooleanSMTP?

Every mailer

Not quite. Custom SMTP sends over SMTP, and PHP Mail through WordPress itself.

Amazon SES, Google Workspace and Microsoft Outlook

Right. Those three send over their API; every other mailer sends over SMTP.

Only Amazon SES

Not quite. Google Workspace and Microsoft Outlook connect by signing in and send over their API too.

Your email is on Microsoft 365. Which mailer fits?

Microsoft Outlook

Right. It sends through your Microsoft 365 account over the Microsoft Graph API.

PHP Mail

Not quite. PHP Mail sends from your web server with no provider behind it.