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  • I don't understand why I need a static IP to get my reply... The reply should be delivered to my MX server (ex. Gmail) not to my computer. Am I right? Commented Nov 27, 2015 at 19:05
  • Yes, you are correct. I guess my point is that an inbox usually exists on a server somewhere in order for outgoing email to be sent. Logically, it makes sense for that server to handle outgoing email as well. Otherwise you would lose things like having a "sent" email folder. Commented Nov 27, 2015 at 19:10
  • Mmh it is reasonable. But I'm free to send a message with Gmail with an unknown "from" or "replyto" address unsing its smtp server... Commented Nov 27, 2015 at 19:14
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    If you use GMail, you have to use smtp authentication. So, the FROM address is set to your @gmail.com address. Otherwise, you would be able to use their service for spoofing. Commented Nov 27, 2015 at 19:30
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    These days, a lot of users couldn't care less about the bounces, BUT a setup that will not accept bounces is usually considered a probable spam source. Commented Dec 1, 2015 at 10:03