No email reception on MacBook Pro
Using Thunderbird on a MacBook Pro (macOS 10.13.2, TB 52.5.0). I stopped receiving email (POP client using AT&T SBCglobal.net servers) on Aug. 27, '17. But can still send & receive email (to/from same mail servers) on my iPhone. Updated to the servers (input and output) to the current servers specified by AT&T (https://www.att.com/esupport/article.html#!/email-support/KM1010523), but no change whatsoever. Any help or advice? -Thanks.