SMTP in wordpress

[Free1]

Hello there, I set up google SMTP with wordpress plugin and i was successful but after 2 days it stopped sending emails. I dont have success even with test email. I contacted my host provider and he told me that emails can be blocked. Could you help me please? Im total beginner. Thanks

[dionv]

Hello @Free1 ,

It may be that GCP blocks the port 25 for sending emails. You may want to consider using Sendgrid or G Suite for SMTP. Attaching here a documentation for "Sending email from an instance".

[Free1]

Hello, maybe this will help in Error Log when I send a test email, (I also tried Sendgrid):

Debug:

Email Source: WP Mail SMTP

Mailer: Google/Gmail

{

"error": "invalid_client",

"error_description": "Client missing a project id."

}

Thanks for any help in advance.