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Sending mail from Python using SMTP - Stack Overflow
How do I figure out the smtp_port for my localhost?
What is the difference between ports 465 and 587? [closed]
How to find out what SMTP port you are using? - Stack Overflow
Sending email with PHP from an SMTP server - Stack Overflow
Is SMTP based on TCP or UDP? - Stack Overflow
Connecting to smtp.gmail.com via command line - Stack Overflow
How to figure out the SMTP server host? - Stack Overflow
How to check if SMTP is working from commandline (Linux)
java - JavaMail smtp properties (for STARTTLS) - Stack Overflow