Start with the requirement
Choose based on sender identity, recipient scope, client capability, network constraints, volume, and who will operate the solution.
Direct Graph is better for new software
A maintained application can implement Microsoft identity directly, control retries and API errors, and avoid adding an SMTP hop. Microsoft Graph is the underlying delivery API used by smtpify365.
smtpify365 is better for fixed SMTP interfaces
Printers, NAS systems, plugins, and older applications may expose only hostname, port, encryption, username, and password fields. The bridge handles OAuth separately without modifying that client.
Do not migrate without a reason
If an existing direct Graph integration is secure and maintained, smtpify365 does not improve it. The product solves client compatibility, not every application-email use case.