I am also using a scarlet acount and these are the results of the connection doctor scanning:
CONNECTED Jul 21 09:11:40.870 [kCFStreamSocketSecurityLevelNone] -- host:smtp.scarlet.be -- port:25 -- socket:0x7fe33a24bbd0 -- thread:0x7fe33a105980
CONNECTED Jul 21 09:11:40.870 [kCFStreamSocketSecurityLevelNegotiatedSSL] -- host:pop.scarlet.be -- port:995 -- socket:0x7fe33a530a90 -- thread:0x7fe338de9ee0
READ Jul 21 09:11:41.063 [kCFStreamSocketSecurityLevelNegotiatedSSL] -- host:pop.scarlet.be -- port:995 -- socket:0x7fe33a530a90 -- thread:0x7fe338de9ee0
+OK POP3 Ready niles 0001e4dd
WROTE Jul 21 09:11:41.081 [kCFStreamSocketSecurityLevelNegotiatedSSL] -- host:pop.scarlet.be -- port:995 -- socket:0x7fe33a530a90 -- thread:0x7fe338de9ee0
CAPA
READ Jul 21 09:11:41.102 [kCFStreamSocketSecurityLevelNegotiatedSSL] -- host:pop.scarlet.be -- port:995 -- socket:0x7fe33a530a90 -- thread:0x7fe338de9ee0
+OK Capability list follows, mate
READ Jul 21 09:11:41.197 [kCFStreamSocketSecurityLevelNegotiatedSSL] -- host:pop.scarlet.be -- port:995 -- socket:0x7fe33a530a90 -- thread:0x7fe338de9ee0
CAPA
TOP
UIDL
RESP-CODES
PIPELINING
USER SASL PLAIN LOGIN
.
WROTE Jul 21 09:11:41.204 [kCFStreamSocketSecurityLevelNegotiatedSSL] -- host:pop.scarlet.be -- port:995 -- socket:0x7fe33a530a90 -- thread:0x7fe338de9ee0
QUIT
READ Jul 21 09:11:41.220 [kCFStreamSocketSecurityLevelNegotiatedSSL] -- host:pop.scarlet.be -- port:995 -- socket:0x7fe33a530a90 -- thread:0x7fe338de9ee0
+OK QUIT
READ Jul 21 09:11:41.669 [kCFStreamSocketSecurityLevelNone] -- host:smtp.scarlet.be -- port:25 -- socket:0x7fe33a24bbd0 -- thread:0x7fe33a105980
220 eir ESMTP - Scarlet
WROTE Jul 21 09:11:41.690 [kCFStreamSocketSecurityLevelNone] -- host:smtp.scarlet.be -- port:25 -- socket:0x7fe33a24bbd0 -- thread:0x7fe33a105980
EHLO [192.168.0.5]
READ Jul 21 09:11:41.704 [kCFStreamSocketSecurityLevelNone] -- host:smtp.scarlet.be -- port:25 -- socket:0x7fe33a24bbd0 -- thread:0x7fe33a105980
250-eir.is.scarlet.be Hello ip-213-49-91-122.dsl.scarlet.be [213.49.91.122], pleased to meet you
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-SIZE 78643200
250-DSN
250-AUTH PLAIN LOGIN
250-STARTTLS
250 HELP
WROTE Jul 21 09:11:41.708 [kCFStreamSocketSecurityLevelNone] -- host:smtp.scarlet.be -- port:25 -- socket:0x7fe33a24bbd0 -- thread:0x7fe33a105980
STARTTLS
READ Jul 21 09:11:41.722 [kCFStreamSocketSecurityLevelNone] -- host:smtp.scarlet.be -- port:25 -- socket:0x7fe33a24bbd0 -- thread:0x7fe33a105980
220 2.0.0 Ready to start TLS
WROTE Jul 21 09:11:41.975 [kCFStreamSocketSecurityLevelTLSv1SSLv3] -- host:smtp.scarlet.be -- port:25 -- socket:0x7fe33a24bbd0 -- thread:0x7fe33a105980
EHLO [192.168.0.5]
READ Jul 21 09:11:41.991 [kCFStreamSocketSecurityLevelTLSv1SSLv3] -- host:smtp.scarlet.be -- port:25 -- socket:0x7fe33a24bbd0 -- thread:0x7fe33a105980
250-eir.is.scarlet.be Hello ip-213-49-91-122.dsl.scarlet.be [213.49.91.122], pleased to meet you
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-SIZE 78643200
250-DSN
250-AUTH PLAIN LOGIN
250 HELP
WROTE Jul 21 09:11:42.003 [kCFStreamSocketSecurityLevelTLSv1SSLv3] -- host:smtp.scarlet.be -- port:25 -- socket:0x7fe33a24bbd0 -- thread:0x7fe33a105980
AUTH PLAIN ************************
READ Jul 21 09:11:42.021 [kCFStreamSocketSecurityLevelTLSv1SSLv3] -- host:smtp.scarlet.be -- port:25 -- socket:0x7fe33a24bbd0 -- thread:0x7fe33a105980
235 2.0.0 OK Authenticated
WROTE Jul 21 09:11:42.040 [kCFStreamSocketSecurityLevelTLSv1SSLv3] -- host:smtp.scarlet.be -- port:25 -- socket:0x7fe33a24bbd0 -- thread:0x7fe33a105980
QUIT
CONNECTED Jul 21 09:13:29.565 [kCFStreamSocketSecurityLevelNegotiatedSSL] -- host:pop.scarlet.be -- port:995 -- socket:0x7fe33a566ab0 -- thread:0x7fe33aa7e3e0
READ Jul 21 09:13:29.758 [kCFStreamSocketSecurityLevelNegotiatedSSL] -- host:pop.scarlet.be -- port:995 -- socket:0x7fe33a566ab0 -- thread:0x7fe33aa7e3e0
+OK POP3 Ready niles 0001e4dd
WROTE Jul 21 09:13:29.768 [kCFStreamSocketSecurityLevelNegotiatedSSL] -- host:pop.scarlet.be -- port:995 -- socket:0x7fe33a566ab0 -- thread:0x7fe33aa7e3e0
CAPA
READ Jul 21 09:13:29.785 [kCFStreamSocketSecurityLevelNegotiatedSSL] -- host:pop.scarlet.be -- port:995 -- socket:0x7fe33a566ab0 -- thread:0x7fe33aa7e3e0
+OK Capability list follows, mate
READ Jul 21 09:13:29.883 [kCFStreamSocketSecurityLevelNegotiatedSSL] -- host:pop.scarlet.be -- port:995 -- socket:0x7fe33a566ab0 -- thread:0x7fe33aa7e3e0
CAPA
TOP
UIDL
RESP-CODES
PIPELINING
USER SASL PLAIN LOGIN
.
WROTE Jul 21 09:13:29.893 [kCFStreamSocketSecurityLevelNegotiatedSSL] -- host:pop.scarlet.be -- port:995 -- socket:0x7fe33a566ab0 -- thread:0x7fe33aa7e3e0
QUIT
READ Jul 21 09:13:29.908 [kCFStreamSocketSecurityLevelNegotiatedSSL] -- host:pop.scarlet.be -- port:995 -- socket:0x7fe33a566ab0 -- thread:0x7fe33aa7e3e0
+OK QUIT