Question
Is it possible to configure relayhost or smarthost in Plesk with Postfix?
Answer
Smarthost configuration is possible starting from Plesk Obsidian 18.0.64.
Warning: If you have already configured a smarthost/relayhost manually, enabling the smarthost feature in Plesk will overwrite your existing configuration. Refer to this documentation here.
Note: With some SMTP relay services (for example, SendGrid), mail forwarding will no longer work if a smarthost is configured.
Follow these steps to configure the smarthost in Plesk:
- Log in to Plesk
- Go to Tools & Settings > Smarthost (under "Mail")
- Select the checkbox "Send users' mail via a smarthost"
- Enter your Smarthost connection details
- (Optional Step) check if the connection to the smarthost can be established by clicking Check Connection
Note: It is necessary to update the SPF record to authorize the smarthost to send emails on domain's behalf. Refer to this article: How to change a DNS record on a Plesk server globally for all domains?