Username and Password not accepted. SMTP could not authenticate. · Issue #1708 · PHPMailer/PHPMailer · GitHub
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Amazon SES 535 Authentication Credentials Invalid - Stack Overflow
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Smtp 535 Error - osTicket Forum
1.7.6.1] Failed to authenticate on SMTP server with username using 2 possible authenticators · Issue #15763 · PrestaShop/PrestaShop · GitHub
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SMTP ERROR: Password command failed 535-5.7.8 Username and Password not accepted. - Google Workspace Admin Community
Getting Error CNC-SDS-0335 Error returned from SMTP server. The error message was: [535 5.7.8 Error: authentication failed from <IP>]. The message could not be sent.
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cPanel: SMTP error 535 Incorrect authentication data - IAMEM HOST
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SMTP Error 535 Authentication Failed - How to Fix?
Urgent help! Server returned an error: "535-5.7.8 Username and Password not accepted - Gmail Community