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Exchange 2016 - IMAP/SMTP Auth on port 587 - Microsoft Q&A
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Which SMTP Port to Use for Email: 25, 587, 465, or 2525?
Cannot send SMTP mail on port 25, try port 587 - Niall Best's Blog
Which SMTP Port to Use for Email: 25, 587, 465, or 2525?
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SMTP Ports (25, 587, 465, or 2525) – What is SMTP Port? How to Choose the Best and Right SMTP Port?
