Install and configure Exim4

@powersj
Trying to get Exim4 to send email to my ISP mail server (smtp.frontiernet.net) after those dipshits @ Yahoo (who frontier outsourced their email accounts to) changed something requiring SSL/TLS, I carefully followed your instructions from “SMTP Authentication” to the end. When I executed the step “sudo update-exim4.conf” I received the following error:

2022-07-14 15:27:26 Exim configuration error:
there are two authenticators called “cram_md5”
Invalid new configfile /var/lib/exim4/config.autogenerated.tmp, not installing
/var/lib/exim4/config.autogenerated.tmp to /var/lib/exim4/config.autogenerated

Examination of the config.autogenerated.tmp file shows that everything from “cram_md5:” to the end of the file (sections cram_md5:, plain:, and login:) have been duplicated exactly.

Any ideas?

uname -a
Linux linux1 4.15.0-189-generic #200-Ubuntu SMP Wed Jun 22 19:53:37 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

exim4 --version
Exim version 4.90_1 #4 built 30-Apr-2021 14:15:04
Copyright (c) University of Cambridge, 1995 - 2017
(c) The Exim Maintainers and contributors in ACKNOWLEDGMENTS file, 2007 - 2017
Berkeley DB: Berkeley DB 5.3.28: (September 9, 2013)
Support for: crypteq iconv() IPv6 GnuTLS move_frozen_messages DKIM DNSSEC Event OCSP PRDR SOCKS TCP_Fast_Open
Lookups (built-in): lsearch wildlsearch nwildlsearch iplsearch cdb dbm dbmjz dbmnz dnsdb dsearch nis nis0 passwd
Authenticators: cram_md5 plaintext
Routers: accept dnslookup ipliteral manualroute queryprogram redirect
Transports: appendfile/maildir/mailstore autoreply lmtp pipe smtp
Fixed never_users: 0
Configure owner: 0:0
Size of off_t: 8
Configuration file is /var/lib/exim4/config.autogenerated