Question
What is the difference between ports 465 and 587?
Answers
Both are protocol.
465 is for SMTPS protocol, In this SSL encryption is started automatically before any SMTP level communication.
587 is for MSA protocol. SSL encryption may be started by STARTTLS command at SMTP level(if server supports). In this ISP does not filter server's EHLO reply.It helps to stop outgoing spam email.    Your Comment




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