Simple Mail Transfer Protocol. A protocol for delivering e-mail from an end user to a server for storage and later retrieval by the intended recipient.

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What steps do Gmail, Yahoo! Mail, and Hotmail take to prevent eavesdropping on email?

I would like to ask what happens when an email is sent from gmail, yahoo or hotmail public web email services? I don't understand email protocols in details, but as far as I know email traffic is ...
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1answer
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Ports used by Online Email Accounts such as Yahoo Mail, Gmail etc

Let us say that I send an email using Yahoo Mail or Gmail. Can this email be intercepted using a packet sniffer? On which port does the email travel? HTTP, SMTP, POP3? Thank you.
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3answers
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Can I expect my e-mail to be routed securely?

If I connect to my e-mail server via SSL (SMTP/SSL) and the recipient also only checks his e-mail via SSL (web/https or IMAP/SSL), does this - generally speaking - increase the security for the ...