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The great firewall of China does block email. If your email address is blocked 1. When you send an email to a recipient in China who is using an email service p
by yegle 6y ago
The great firewall of China does block email. If your email address is blocked
1. When you send an email to a recipient in China who is using an email service provider whose MTA does not support SSL/TLS/STARTTLS: the delivery attempt by your email service provider will result in a TCP reset.
2. Similarly, if someone in China want to send an email to your blocked email address but their MTA doesn't support SSL/TLS/STARTTLS: their attempt to send the email will result in a TCP reset.
I know this because my Gmail account is blocked in this way.
- rsecora 6y agoAnd if you can reach the MTA, that means the email itself is unencrypted. So the MTA can monitor the email content.
- yegle 6y agoThis goes both ways. If I want to send an email to someone but their MTA doesn't do encryption, I might choose to encrypt the content of my email, but I have no way to hide my FROM. Blocking the MTA server is not unheard of.
- rsecora 6y agoRight, metadata is not encrypted for the MTA. That's the flaw in the email protocol for full anonymity, even using PGP.