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SMTP Error (-1): Connection to server failed. · Issue #13275 · YetiForceCompany/YetiForceCRM · GitHub
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SMTP Error(-1): Connection to the server failed. | DirectAdmin Forums
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How to Fix SMTP ERROR: Failed to connect to server: Connection refused (111) error on WordPress - Interserver Tips
SMTP Error(-1): Connection to the server failed. | DirectAdmin Forums
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Smtp error: Failed to connect to server" - Causes and Fixes
How to fix SMTP Error (-1): Connection to server failed in RoundCube? - Knowledgebase - AccuWebHosting
SMTP ERROR: Failed to connect to server: (0) · Issue #1013 · PHPMailer/PHPMailer · GitHub
