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The Mailrelay integration sends over SMTP. It asks for SMTP Host, SMTP Port, Use SSL/TLS, SMTP Username and SMTP Password, plus your Default From Email, Default From Name and Default Reply-To Email. The password is stored encrypted and never shown again.

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SMTP settings

1

Open SMTP settings

Log in to Mailrelay and go to Settings → SMTP settings.
2

Copy the values

Copy the server, port, user name and password shown there into SMTP Host, SMTP Port, SMTP Username and SMTP Password. Turn on Use SSL/TLS when the port Mailrelay lists uses it.
3

Set the sender

Use a Default From Email on a domain you have verified as a sender in Mailrelay.
Leave Disable TLS validation off unless Mailrelay support tells you otherwise. Mailrelay’s own guide: SMTP settings. The same form works for any SMTP server: enter that server’s host, port and login.