For higher volume.
WHEN TO CONSIDER ONE
You send newsletters or marketing mail You send substantial transactional volume Your shop sends many order emails Deliverability matters commercially
WHAT THEY PROVIDE
Established sending infrastructure Better deliverability than a shared hosting server Reporting on delivery, bounces and complaints Handling of unsubscribes
WHY IT HELPS
They maintain sending reputation professionally.
WHAT TO SET UP
Authentication for the service on your domain The service configured as your sending route
WHAT TO KEEP SEPARATE
Marketing mail and transactional mail.
A marketing complaint should not affect your order confirmations.
Many businesses use different services or different subdomains for each.
WHAT TO MONITOR
Delivery rates Bounces Complaints
WHAT TO AVOID
Sending marketing mail from your main mail server at volume.
A complaint rate there affects all your mail.
