3.3 POP3 expects "CRLF.CRLF" eob for some single-line responses
3.4 AUTH PLAIN for SMTP is not working on all servers
3.5 APOP authentication fails on POP3
+ 3.6 POP3 issue when reading small chunks
4. Command line
See https://github.com/curl/curl/issues/10073
+3.6 POP3 issue when reading small chunks
+
+ CURL_DBG_SOCK_RMAX=4 ./runtests.pl -v 982
+
+ See https://github.com/curl/curl/issues/12063
+
4. Command line
5. Build and portability issues