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Server error: '501 <mailto:user@domain.com>: "@" or "." expected after "mailto"'
Email sending error from Outlook - Server error: '501 <mailto:user@domain.com>: "@" or "." expected after "mailto"'
Email sending error: 535 - Incorrect authentication data
How to solve '550 sender verify failed' error message?
Webmail Login Security - Security Policy Handling Failed
Webmail Login Security - Security Policy Handling Failed