cnp3-ebook/protocols/email — English @ Weblate

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218 ../../protocols/email.rst:483

	English It could be surprising that the `To:` is not mandatory inside an email message. While most email messages will contain this header line an email that does not contain a `To:` header line and that relies on the `bcc:` to specify the recipient is valid as well. 259/10000 · 259
219 ../../protocols/email.rst:485

	English The list of all standard email header lines may be found at http://www.iana.org/assignments/message-headers/message-header-index.html 133/10000 · 133
220 ../../protocols/email.rst:487

	English During the last years, many Internet Service Providers, campus and enterprise networks have deployed SMTP extensions :rfc:`4954` on their MSAs. These extensions force the MUAs to be authenticated before the MSA accepts an email message from the MUA. 249/10000 · 249
221 ../../protocols/email.rst:489

	English The first versions of SMTP used `HELO` as the first command sent by a client to a SMTP server. When SMTP was extended to support newer features such as 8 bits characters, it was necessary to allow a server to recognize whether it was interacting with a client that supported the extensions or not. `EHLO` became mandatory with the publication of :rfc:`2821`. 358/10000 · 358
222 ../../protocols/email.rst:491

	English This implies that a valid email message cannot contain a line with one dot followed by `CR` and `LF`. If a user types such a line in an email, his email client will automatically add a space character before or after the dot when sending the message over SMTP. 260/10000 · 260
223 ../../protocols/email.rst:493

	English :rfc:`1939` defines the APOP authentication scheme that is not vulnerable to such attacks. 90/10000 · 90
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