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Hi support team.
We’re using WP Mail SMTP on our websites without any issues until now; unfortunately all our websites are effected by the following error:
Mailer: Andere SMTP-server
SMTP Error: Could not authenticate.SMTP server error: QUIT command failed
We have an integration and are doing a connection to Mailgun through SMTP. It occured on websites that we’re previously working without any issues, so it’s not an issues with credentials.
