Email Issues

Background:

I transferred my email from my residential account   "xxxxxxxx@comcast.net"  to my new business account back in June.  Everything has been working flawlessly since, until yesterday, I can no longer send or receive email from my iPhone or my iMac. 

I am not sure what the actual issue is, but I do know that I have connectivity to the internet, Comcast Customer Service confirms that the email address was in fact transferred.  When I attempt to send or receive I get an authentification error, leading me to believe that something has changed on the Comcast server side not allowing me to log in.

Any thoughts?  

Below is a log of the connecting status messages as it attempts to connect to the Comcast Servers:

INITIATING CONNECTION Oct 26 12:43:22.139 host:mail.comcast.net -- port:995 -- socket:0x0 -- thread:0x608000861a00

CONNECTED Oct 26 12:43:22.367 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:mail.comcast.net -- port:995 -- socket:0x6080002d1a30 -- thread:0x608000861a00

READ Oct 26 12:43:22.397 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:mail.comcast.net -- port:995 -- socket:0x6080002d1a30 -- thread:0x608000861a00
+OK POP3 ready

WROTE Oct 26 12:43:22.397 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:mail.comcast.net -- port:995 -- socket:0x6080002d1a30 -- thread:0x608000861a00
CAPA

READ Oct 26 12:43:22.429 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:mail.comcast.net -- port:995 -- socket:0x6080002d1a30 -- thread:0x608000861a00
+OK Capability list follows
EXPIRE 31 USER
TOP
UIDL
USER
XOIP
SASL PLAIN
.

WROTE Oct 26 12:43:22.429 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:mail.comcast.net -- port:995 -- socket:0x6080002d1a30 -- thread:0x608000861a00
AUTH PLAIN

READ Oct 26 12:43:22.580 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:mail.comcast.net -- port:995 -- socket:0x6080002d1a30 -- thread:0x608000861a00
+

WROTE Oct 26 12:43:22.582 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:mail.comcast.net -- port:995 -- socket:0x6080002d1a30 -- thread:0x608000861a00
************************************************

INITIATING CONNECTION Oct 26 12:43:32.160 host:smtp.comcast.net -- port:587 -- socket:0x0 -- thread:0x608001062e40

READ Oct 26 12:43:32.838 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:mail.comcast.net -- port:995 -- socket:0x6080002d1a30 -- thread:0x608000861a00
-ERR authentication failed: LOGIN failed

WROTE Oct 26 12:43:32.838 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:mail.comcast.net -- port:995 -- socket:0x6080002d1a30 -- thread:0x608000861a00
AUTH PLAIN

CONNECTED Oct 26 12:43:33.708 [kCFStreamSocketSecurityLevelNone] -- host:smtp.comcast.net -- port:587 -- socket:0x6080004d5690 -- thread:0x608001062e40

READ Oct 26 12:43:33.777 [kCFStreamSocketSecurityLevelNone] -- host:smtp.comcast.net -- port:587 -- socket:0x6080004d5690 -- thread:0x608001062e40
220 resomta-po-16v.sys.comcast.net comcast ESMTP server ready

WROTE Oct 26 12:43:33.800 [kCFStreamSocketSecurityLevelNone] -- host:smtp.comcast.net -- port:587 -- socket:0x6080004d5690 -- thread:0x608001062e40
EHLO [10.1.10.24]

READ Oct 26 12:43:33.896 [kCFStreamSocketSecurityLevelNone] -- host:smtp.comcast.net -- port:587 -- socket:0x6080004d5690 -- thread:0x608001062e40
250-resomta-po-16v.sys.comcast.net hello [50.155.64.235], pleased to meet you
250-HELP
250-AUTH LOGIN PLAIN
250-SIZE 36700160
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-STARTTLS
250 OK

WROTE Oct 26 12:43:33.897 [kCFStreamSocketSecurityLevelNone] -- host:smtp.comcast.net -- port:587 -- socket:0x6080004d5690 -- thread:0x608001062e40
STARTTLS

READ Oct 26 12:43:33.966 [kCFStreamSocketSecurityLevelNone] -- host:smtp.comcast.net -- port:587 -- socket:0x6080004d5690 -- thread:0x608001062e40
220 2.0.0 Ready to start TLS

WROTE Oct 26 12:43:34.171 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:smtp.comcast.net -- port:587 -- socket:0x6080004d5690 -- thread:0x608001062e40
EHLO [10.1.10.24]

READ Oct 26 12:43:34.217 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:smtp.comcast.net -- port:587 -- socket:0x6080004d5690 -- thread:0x608001062e40
250-resomta-po-16v.sys.comcast.net hello [50.155.64.235], pleased to meet you
250-HELP
250-AUTH LOGIN PLAIN
250-SIZE 36700160
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 OK

WROTE Oct 26 12:43:34.220 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:smtp.comcast.net -- port:587 -- socket:0x6080004d5690 -- thread:0x608001062e40
AUTH PLAIN (*** 80 bytes hidden ***)

READ Oct 26 12:43:34.356 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:smtp.comcast.net -- port:587 -- socket:0x6080004d5690 -- thread:0x608001062e40
535 5.7.0 ...authentication rejected (4)

WROTE Oct 26 12:43:34.359 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:smtp.comcast.net -- port:587 -- socket:0x6080004d5690 -- thread:0x608001062e40
AUTH PLAIN (*** 52 bytes hidden ***)

READ Oct 26 12:43:34.512 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:smtp.comcast.net -- port:587 -- socket:0x6080004d5690 -- thread:0x608001062e40
535 5.7.0 ...authentication rejected (4)

WROTE Oct 26 12:43:34.512 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:smtp.comcast.net -- port:587 -- socket:0x6080004d5690 -- thread:0x608001062e40
QUIT