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→Gmail (with mode relay of Gmail with Google Workspace - GSuite)
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Note 1: You must first setup your Google account to relay outgoing email and to set the list of ip of your SMTP clients (https://admin.google.com, Application - GSuite - GMail - Advanced setup - Routing). Then choose "Accept all emails from my domain" or "Accept all", Choose "Enable TLS" and choose "SMTP authentication required" to no (Choice A) or yes (Choice B). If you try the choice A and got the error
Note 1: You must first setup your Google account to relay outgoing email and to set the list of ip of your SMTP clients (https://admin.google.com, Application - GSuite - GMail - Advanced setup - Routing). Then choose "Accept all emails from my domain" or "Accept all", Choose "Enable TLS" and choose "SMTP authentication required" to no (Choice A) or yes (Choice B). If you try the choice A and got the error
<pre>
<pre>
−550-5.7.1 Invalid credentials for relay [2001:41d0:304:200::b3e4]. The IP
+550-5.7.1 Invalid credentials for relay [x:y:z:a:b:c:d:e]. The IP
550-5.7.1 address you've registered in your G Suite SMTP Relay service doesn't
550-5.7.1 address you've registered in your G Suite SMTP Relay service doesn't
550-5.7.1 match domain of the account this email is being sent from. If you are
550-5.7.1 match domain of the account this email is being sent from. If you are