3.2 No disconnect command
3.3 SMTP to multiple recipients
3.4 POP3 expects "CRLF.CRLF" eob for some single-line responses
+ 3.5 AUTH PLAIN for SMTP is not working on all servers
4. Command line
4.1 -J and -O with %-encoded file names
response commands. Please see the POP3 examples and test cases which show
this for the NOOP and DELE commands. https://curl.haxx.se/bug/?i=740
+3.5 AUTH PLAIN for SMTP is not working on all servers
+
+ Specifying "--login-options AUTH=PLAIN" on the command line doesn't seem to
+ work correctly.
+
+ See https://github.com/curl/curl/issues/4080
4. Command line