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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2
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2answers
297 views

Is it unsafe to allow apps other than Outlook to send email via the Exchange server?

My application is a .NET Windows Forms client, one of whose functions is to allow the user to send personalised mailshot emails to opted-in recipients stored in the database. The emails are sent ...
7
votes
2answers
1k views

If I send an email over SSL, will it always be transmitted over SSL?

This is largely a question of how MTAs and different components communicate. I'm curious that if I send an email using SMTP over SSL to my MTA, can it's next jump to the next MTA or MDA be insecure? ...
3
votes
1answer
1k views

How can I find the process that is trying to use smtp to send email?

Previously I asked Who (which process) is calling curl? and I got very good answers (this answer in particular) which basically replace the curl binary with a shell script that logs each call to curl ...
12
votes
3answers
960 views

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 ...
7
votes
1answer
2k views

Email SSL security?

I use IMAP and I only access my email through SSL. However, the settings for encrypted email access seem a bit more complicated that https. Can someone explain the security implications of the ...
25
votes
4answers
15k views

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 ...
9
votes
1answer
171 views

Long running SMTP session

I recently noticed an SMTP session on my server which started when a remote host connected but never seemed to result in any emails being delivered. I could see that it was probably a SPAM site and so ...